COMPENDIUM OF GENERIC DISTINCTIONS. 



793 



Family. APHID/E. Antennae seven-jointed. Wings 

 numerously veined. Beak four-jointed. Ocelli three, in a 

 triangle. Front wings largest. 



Genus. APHIS. Abdomen with two projections. Antennae 

 long, hair-like. Proboscis short. 



Section. MONOMER A . Tarsi one-jointed. Wings not 

 celled. Antennae from six to twenty-five joints. 



Family. COCCID/E. As Section. 



Genus. L'occus. Male winged; abdomen with two long 

 filaments at side and shorter appendage in middle. Females 

 gall-like, fixed. 



Order. H ETEROPTERA. Wings four, front pair largest, 

 partly overlapping. Basal part leathery, rest membranous. 

 Body flattened. 



Section. HYDROCOR!SA.A.q\ia.\.\c. Legs for swim- 

 ming. Fore-legs short and folding, for prehension. Antennae 

 very short, hidden in furrows under eyes. 



Family. NOTONECTID/E. Hind-legs long, fringed, and 

 oar-like. Body boat-shaped. Beak short, sharp, and thick. 



Genus. NOTONBCTA. Body oval, cylindrical. Front tarsi 

 three-jointed. 



Family. NEPID^E. Front legs strongly raptorial; tibia 

 united to tarsus. Body very flat. 



Genus. NKPA. Body broad. Two bristles at end of abdo- 

 men. 



Section. A UROCORISA .Antennae long, not concealed. 

 Legs for running, not for swimming. 



Family. HYDROMETRID^. Body long, narrow. An- 

 tennae four-jointed. 



Genus. GERRIS. Basal joint of antennae largest. Fo'ur 

 hind-legs very long, two fore-legs distant from hind limbs. 



Genus. DIACTOR. Joints of antennae of equal length. 

 Hind pair of legs with large flattened plates. Brazil. 



Family. REDUVIID/E. Beak short, thick, and naked. 

 Head narrowed behind into neck. Ocelli two. Tarsi three- 

 jointed. 



Genus. ARILUS. Prothorax elevated and notched like a 

 cog-wheel. West Indies. 



Genus. HAMMATOCERUS. Second joint of antennas com- 

 posed of great number of minute joints. 



Genus. DALADKR. Abdomen flat, wide. Third joint of 

 antennae flattened and leaf-like. Thorax expanded. India. 



Family. CIMICID^E. Wingless. Antennae four-jointed. 

 Abdomen very flat and rounded. Tarsi three-jointed. 



Genus. CIMEX. As Family. 



Family. TINGID^E. Small. Body broad and flat. Beak 

 three-jointed, received into groove on under side of head. 



Family. CAPSID/E. Body convex, soft ; second joint of 

 antennae often thickened at tip. Females with long, sabre- 

 shaped ovipositor. 



Genus. MIRIS. Long, narrow. Antennae very long, sec- 

 ond joint largest, first joint thickest. No ocelli. 



Family. LYGJEIDjE. Small. Antennae four-jointed. 

 Tarsi three-jointed, with two cushions between claws. 



Family. COREIDjE. Large. Antennae four-jointed, end 

 joint large, thick, or long. Ocelli near each other. Beak 

 four-jointed, moderate. 



Family. SCUTELLARID.E. Beak four-jointed, long. 

 Antennae often five-jointed, last joint like others. Scutellum 

 large. 



Genus. EDESSA. Thorax very wide, produced into a long 

 sharp point on each side. 



Genus. SCUTELLARIA. Scutellum very long, reaching 

 almost to extremity of abdomen. 



Order. APHANIPTERA. Wings four, very minute, 

 like scaly plates on sides of thorax. Antennae minute. Mouth 

 for suction ; tarsi five-jointed. 



Family. PULICID^. As Order. 

 Genus. PULEX. Labial palpi jcZnted. 



A pair of winglets at base, second pair of wings replaced by 

 balancers. Mouth for sucking. Tarsi five-jointed. 



Section. CPMALOTA.Hea.d distinct from thorax. 

 Claws of tarsi not toothed. 



Stirps. NEMOCERA. Antennae more than six joints; 

 palpi with four or five joints. 



Family. CULICID^E. Very long beak, rather thick at 

 p, composed 

 plumed in male. 



, 



tip, composed of seven pieces. Head small. Antennae 

 lu 



Order DIPTERA. Wings t<co, membranous, not folded. 



Genus. CULBX. Palpi of male larger than thorax, very 

 short in female. 



Family. TIPULIDJE. Proboscis very short. Palpi 

 larger than proboscis, four-jointed. 



Genus. TIPULA. Antennae larger than head, not plumed, 

 thirteen-jointed. Last joint of palpi moderately long. Seven 

 cells at end of wings. 



Section. BRA CHOCERA .Antennae very short. Palpi 

 with one or two joints. 



Stirts. NOTACA NTH A. \ntermx apparently three- 

 jointed, last joint articulated. 



Family. TABINID^E. Mouth with six lancets in female, 

 four in male. Maxillary palpi two-jointed. Eyes very large. 



Genus. TABANUS. Antennae seven-jointed, not longer 

 than head. 



Genus. GLOSSINA. Mouth with exserted proboscis, fur- 

 nished with poison-gland at base. Thorax much longer than 

 wide. South Africa. 



Siirps. A THERICERA . Antennae two or three joints, 

 bristle at tip. 



Family. SYRPHIDjE. Proboscis with four internal 

 pieces. 



Genus. ERISTALIS. Body stout and hairy ; fourth longi- 

 tudinal nervure of wing much curved before tip. Eyes of 

 male touching each other. 



Bristles of antennae naked or 



haired. 



Family. MUSCID^E. Proboscis enclosing two pieces, 

 short, thick, and membranous. Antennae three-jointed, third 

 largest. Nervures of wings few. 



Family (ESTRID.^. No visible mouth, or only minute 

 tubercles. Antennas very short. 



Genus. OESTRUS. Nervures not extending to hinder edge 

 of wings. 



Stirps. PUPIPARA.n^A sunk in thorax. Claws 

 toothed. 



Family. HIPPOBpSCID^. Head distinct. Legs short, 

 stout, fifth joint of tarsi largest. 



Genus. HIPPOBOSCA. Wings ample. Nervures not ex- 

 tending to tip. 



CLASS. CRUSTACEA. 



Ringed animals, with horny or calcareous exterior ; 

 limbs articulated Respiration by gills or skin ; 

 sexes separate. 



Sub-class. PODOPTHALM ATA. Eyes on movable 

 footstalks. 



Order. DECAPODA. Walking legs ten. Mouth-limbs 

 twelve. Gills on side of carapace. 



Sub-order. BRACHYURA. Abdomen very small, folded 

 under the body. 



Tribe. OXYRHYNCHITA .Carapace narrow in front, 

 and forming a beak. Mouth apparatus squared. 



Family. MACROPODIAD^. Legs long and slender, 

 second or third pair larger than first. 



Genus. STENORHYNCHUS. Carapace triangular, prolonged 

 into two-forked beak. Eyes not retractile. First joint of 

 outer antennae narrow, third larger than second. Abdomen 

 six joints. Many seas. 



Genus. LEPTOPODIA. Claw-legs well developed, short. 

 Antennae feathered. West Indies and warm seas. 



Genus. CAMPOSCIA. Carapace smooth; claw-legs small; 

 limbs with stout bristles. Antennae short and partly feathered. 

 Mauritius'. 



