60 



ENTOMOLOGY. 



FAMILY II. TANYSTOMA. 



Rostrum frequently lengthened, sometimes nearly concealed ; 

 tucker of six pieces. 



TRIES I. TABAMI. 



Terminal joint of autennip without seta or ctyle at its tip, 

 with four or eight transverse rings; rostrum prolonged, in 

 many species filiform and external; wings always distant. 

 fa bantu sffricanii, pi. 34, f. 138. 



TBIBB II. SICABII. 



The greater part of the rostrum frequently concealed, with 

 two terminal projecting lips: sucker of four pieces; last joint 

 of antennae destitute of style or seta, and consisting of three 

 transverse divisions. Caenomyia pallida, pi. 34, f. 139. 



TRIBE III. MYDASII. 



Without exterior palpi ; terminal joint of antennae stylifer- 

 ous or rlavate, divided transversely, with an umbilicus at the 

 tip, in the form of au elongated cone, or subulate. Mydai Lttti- 

 ttinicut, pi, 34, f. 140, a and t>. 



TBIBB IV. LKPTIDKS. 



With exterior palpi ; antennae very short, of equal thickness. 

 granulated, or nearly moniliform, terminated by seta. Leptit 

 fatciata, pi. 34, f. 141. 



TRIBB V. DOLICIIOPODA. 



Rostrum very short, with two large terminal lahriform pro- 

 cesses, with palpi placed on them, or produced with a short 

 beak ; last joint of antennae flattened, and provided with a 

 seta ; wings resting on the body. Porphyrops diaphanus, pi. 

 84, f. 142. 



TRIBE VI. ASILICI. 



Mouth bearded ; terminal joint of antennae elongated, fili- 

 form, or clavate, with a styliferous termination, nr thick and 

 stiff hair; body oblong; thorax compressed before. Asilus 

 crabroniformit, pi. 34, f. 143. 



TRIBB VII. HTBOTINI. 



Head globular, wholly occupied by the eyes in males ; ter. 

 minal joint of antennae lenticular, with an elongated hair- 

 shaped seta. Ocydromya glabricola, pi. 34, f. 144. 



TRIBB VIII. EMPIDBS. 



Rostrum produced, nearly cylindrical and perpendicular, 

 inclosing a sucker ; antennae formed of two or three principal 

 pieces, the last undivided ; body elongated ; balancers naked ; 

 head round ; abdomen cylindrical or conical ; feet long. Empit 

 pcnnipet, pi. 34, f. 145. 



TRIBB IX. ANTHRACII. 



Body not raised on the back, short, and broad ; wings re- 

 mote ; head placed against the thorax, and on a level with it, 



mote ; head placed against the thora 

 Anthrax marginicoltls, pi. 34, f. 146. 



TRIBB X. BOMBVLIARII. 



Head inserted low ; thorax elevated and gibbous ; balancers 



naked ; abdomen oblong or triangular ; rostrum directed for- 



wards ; antennae approximate at their base, terminated by a 



Beta, without a style. . Bombylius major, pi. 34, f. 147. 



TRIBB XI. VESICULOSA. 



Head inclined, thorax elevated ; balancers covered by a 

 plate ; abdomen inflated, vesicular ; antennae two-jointed, very 

 small in some species, with a terminal seta; or sometimes 

 three-jointed, last having no style or seta. Henopt margina- 

 tut, pi. 34, f. 148. 



FAMILY III. NOTACANTHA. 



Rostrum generally membranous, short, concealed, except the 

 terminal lips ; sucker of two pieces ; in others long, syphon- 

 shaped, and concealed by a produced beak, which supports the 

 antennae ; terminal joint of antennae, with many rings ; wings 

 resting on the body, and provided with a central radiated 

 ariola. 



TRIBB I. XTLOPHAOEI. 



Terminal joint of antennae divided into eight rings. Berit 

 viulaceut, pi. 34, f. 149. 



TRIBB II. STRATIO.MYDES. 



Terminal joint of antennae with five or six rings, exclusive 

 of the style. Stratiomyt chamceleon, pi. 34, f. 150. 



FAMILY IV. ATHERICBRA. 



Sucker consisting of two or four pieces, the two contiguous 

 ones provided with palpi; retracted within the sucker into a 

 furrow of the proboscis. 



TRIBE I. SYRPIII-E. 



Antennae of various lengths, some placed on a pedicle, their 

 seta simple. Syrphut obscurut, pi. 34, f. 161. 



TRIBB II. CONOPSARI.Z. 



Proboscis syphon-shaped, either conical, cylindrical, or seta- 

 ceous. Cimnpi macrocepkala, pi. 34, f. 152. 



TRIBB III. CESTRIDBS. 



Buccal cavity bitnberculate in some, in others a small cleft ; 

 proboscis exceedingly small where it exists ; in some two palpi ; 

 nnteunaBvery short, inserted in a cavity. CEttrus Sovis, pi 

 84, f. 163. 



TRIBB IV. UCSCIDM. 



Antennas two or three-jninted, the latter prevailing, last 

 joint depressed, with a simple or plumose seta on its back, near 

 the base ; proboscis membranous, bilobate, geniculate, with- 

 drawn into a buccal cavity in r 

 Mutca yomitoria, pL 34, f. 154. 



, , , 



drawn into a buccal cavity in repose ; sucker with two setae. 

 , f. 



SECTION II. 



Proboscis consisting of two setae, emerging from the huoca. 

 cavity, covered by two plates or palpi, instead of a sheath. 



FAMILY V. PUFIPAR*. 



TRIBE I. CORIACKJB. 



Many species have wings, head and eyes of ordinary form 

 and size ; with a square thorax. Hippobotca equina, ul. 34, 

 f. 155. 



TBIBB II. PHTRYROMYI.B. 



Body apterous ; head small, appearing like a capsular tuber. 

 cle placed on the thorax, which is semicircular ; eyes small, 

 granulated. Kycteribia vespertilionii. 



DESCRIPTION OF EXTERNAL PARTS OF 

 INSECTS. 



PLATE XXXI. 



THE HEAD AND ITS EXTERNAL ORGANS. 



The HEAD furnishes the most distinctive characters of in- 

 sects. It is exceedingly varied in its general form, as well as 

 in its several parts. The most important of these are the mouth, 

 antenna, and f yet. The head of a Dipterous insect is repre- 

 sented, figure 22, with all its appendages ; but the head, inde- 

 pendently of these is confined within the limits of a a f. 22, 25. 



MOUTH. This organ is very complicated, and subject to great 

 diversity of form, and construction, admirably adapted to the 

 nature of its food. It consists of six parts, the labrum, man- 

 dibles, maxillte, palpi, labium, and mentum. 



Labrum, or upper lip, figs. 22, 23, 25, e, e, e. 

 Mandibles, f. 25, k, k. 



Maxilla, f. 24, i. 



Palpi, f. 22, 23, 24, 25, b, b, b, b, b, b. 



Labial lobes, f. 22, 23, 25, g, g, g. 



Mentum, f. 31, a, 



Proboscis, f. 31, b. 



Lingua or tongue, f. 31. c. 



Trophi, f. 31. 



ANTBNNJE. Horn-like processes consisting of several joints ; 

 considered by some naturalists as organs of touch, and by others, 

 organs of hearing, f. 22, rf. 



Nasus or nose, f. 22, /. 



Eyes, f. 22, I, I. 



Neck, f. 22, A. 



The Thorax and its several divisions ; f. 26. 



Collar, or prothoracic scutellum, f. 22, 26, m. m. 



Pratscutum, f. 26, n. 



Scutum, o. 



Scutellum, p. 



Metathoracic Scutum, f. 26, q. 



To the Thorax are attached the wings, r, r ; the rudimental 

 alulte or winglets w; the base of the intermediate femur t ; the 

 balancers ; the base of the posterior femur v. and the legs. 



Wing, f. 25, w. 



Elytra, are membranous, or horny substances which cover 

 the wings of insects of the order Coleoptera f. 25, *, x. 



Upper or superior wing of a Lepidopterous insect, f. 27. 



Anterior margin, or costal nerve, a. 



Interior margin, b. 



Exterior margin, c. 



Post -costal nerve, d. 



Anal nerve, e. 



Compound ocellus, or the discoidal cell,f. 



Dentate fascia, g. 



Lower or inferior wing of a Lepidopterous insect, f. 28. 



Anterior margin, a. 



Exterior margin, b. 



Interior margin, c. 



THE ABDOMEN. 



The abdomen, is that part which is attached to the posterior 

 extremity of the thorax, and consists of six segments or wings, 

 to which there are never any legs attached, f. 29. 



THE LEGS. 



In the whole insect tribe, they are provided with but six legs : 

 they are composed of five parts, f. 30. 



Coxa, or haunch, is the first joint, a. 



Trochanter, or second joint, ft. 



Femur, or thigh, c. 



Tibia, or shank, d. .-._ 



Tarsus, e. This member consists of from three to five arti- 

 culate parts, among Coleopterous insects, and most others. I 

 the last of these articulations are attached the clawr. 



