556 Div. 3. ARTICULATA— INSECTA. Class 3. 



marie us acquainted with a great number of species, and some new genera, of this minute and curious 

 tribe.] 

 ThDse which have eleven joints to the antennae form the genus 



PsELAPHUS, Herbst. 

 Some, few in number, have two una^ues to the tarsi. 



Chenitium, Latr., has the ten basal joints of the antennae equal-sized, and the palpi not exserted. C. bitubercu- 

 lalum, [a continental species]. 



Dionix, Dej., has tlie tliiid and four following joints of the antenna: very minute ; the eighth and three following' 

 thicker than tl^e preceding, and as long as the seven preceding together ; the maxillary palpi exserted, and the 

 labial palpi short, stretched forwards, and 3-jointed, with a point at the tip. 



The others have but a single tarsal unguis, and some of these have the maxillary palpi very Imig ind elbowed, 

 the second and fourth joints being especially elongated. 



Pgelaphus proper, differs from the two following by having the antennae evidently longer than the head and 

 thorax, and terminated by a club formed of the last three joints, which are evidently longer than the preceding. 

 \_Ps. llerbstii, and several other British species.] 



BylhinUs, Leach (having the second joint of the antenna; thick and dilated into a lateral tooth— P^s. securiger, 

 Reich.), and 



Arcnpfigiis, Leach (having the second joint of the antennae slender, and the basal one sometimes dilated — Ps. 

 glabncollis, Leach), have the ninth and tenth joints of the antennae scarcely thicker or larger than the preceding, 

 but the eleventh very large. 



In others the maxillary palpi are shorter than the head and thorax, and the fourth joint, at least, is short, and 

 ovoid or triangular. 



C^(?«i4/e*, Reichenb., has the three terminal joints of the maxillary palpi armed with a tooth of the outside. 

 [Ct. palpalis, a continental species.] 



Bri/axis, Leach (and Euplectus and Tychus, Leach), have the maxillary palpi of the ordinary form, the last joint 

 longer, conical, or hatchet-shaped ; the thorax is short, and scarcely longer than broad; the form of the last joint 

 of the palpi and of the joints of the antennae, although offering good characters, does not appear sufficiently 

 important for the establishment of [Leach's] genera. 



The terminal Pselaphiens have the antenna; composed of only six joints, or are even inarticulate. 



Claviger. 



Claviger proper has distinctly G-jointed antennae, the eyes appear wanting, and the maxillary palpi are very 

 short. The species are found under stones, and in the nests of small yellow Ants. [Claviger fareolatus, a minute 

 species, first detected by me in England in 1S3S, in Whychwood Forest, Oxfordshire.] See the monographs of 

 Germar in the third volume of his Magasht der Entomologie, Aub^, Gylienhall, [and particularly the recently pub- 

 lished memoir of Schmidt.] 



Articerus, Dalm., has the antennae apparently composed of a single joint, forming a long cylinder, truncated at 

 the tip ; the eyes are distinct. A. armatus, observed by IXalraan in giim copal. 



Note. — The tarsi of Dermestcs atomarius, De Gear, having appeared to M. Leclerc de Laval to be 

 composed of only a single joint, we had formerly established for its reception a new primary section 

 of the Coleoptera, which we had thence named Monomera. Fischer adopted this section, giving 

 the generic name of Clambtis to the insect ; Schuppell had also proposed for it that of Ptilium ; 

 M. Gylienhall has, however, reunited the species to Scaphidium, and, in fact, we consider that this 

 new genus ought to be placed near that genus ; the section Monomera must, therefore, be suppressed. 

 [Having carefully examined these minute insects, I am able to state that their tarsi consist of 

 several joints.] 



THE SIXTH ORDER OP INSECTS,— 



ORTHOPTERA, (Ulonata, Fabr.), [DEnMAPxERA, De Geer],— 



United, for the most p.art, by Linnaeus witli the Hcmiptera, and by Geoffroy with the Cole- 

 optera, but forming a ])cculiar division, exhibit a body generally less firm than the last men- 

 tioned order ; soft, semimembranous, wing-covers much nerved, and not uniting at the suture 

 in a straight line ; wings folded longitudinally, and often fan-like, divided by transverse 

 nervurcs ; maxilhc always terminated by a corneous denticulated piece, and covered by a 

 galea, corresponding with the outer division of the maxillae of the Coleoptera; and lastly, a 

 kind of tongue, or epiglottis. 



