556 INSECTA. 



made us acquainted with a great number of species, and some new genera, of tliis minute and curious 

 tribe.] 



Those which have eleven joints to the antennas form the genus 



Pselaphus, Herbst. 



Some, few in number, have two ungues to the tarsi. 



Chennium, Latr., has the ten basal joints of the antenna; equal-sized, and the palpi not exserted. C. bitubercu- 

 latum, [a continental species]. 



Dionix, Dej., has the third and four following joints of the antennae very minute ; the eighth and three following 

 thicker than the 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 long and elbowed, 

 the second and fourth joints being especially elongated. 



Pselaphus proper, differs from the two following by having the antenna; 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. Herbstii, and several other British species.] 



Bythinus, Leach (having the second joint of the antennae thick and dilated into a lateral tooth— Ps. securiger, 

 Reich.), and 



Areopagus, Leach (having the second joint of the antenna; slender, and the basal one sometimes dilated — Ps. 

 glabricollis, 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. 



Ctenistes, Ileichenb., has the three terminal joints of the maxillary palpi armed with a tooth of the outside. 

 [Ct. palpalis.a continental species.] 



Bryaxii, Leach (and Eupleetus and Tt/chus, 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 antenna", although offering good characters, does not appear sufficiently 

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



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



Claviger. 



Claviger proper has distinctly 6-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 faveolaius, a minute 

 species, first detected by me in England in 1S38, in Whychwood Forest, Oxfordshire.] See the monographs of 

 Germar in the third volume of his Magasi/i der Entomologie, Aube", Gyllenhall, [and particularly the recently pub- 

 lished memoir of Schmidt.] 



Artieerus, Dalin., 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 Dalman in gum copal. 



Note. — The tarsi of Dermestes atomarius, De Geer, 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 Clambus to the insect ; Schuppell had also proposed for it that of Ptilium ; 

 M. Gyllenhall 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 OF INSECTS,— 



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



United, for the most part, by Linnaeus witli the Hemiptera, and by Geoffroy with the Cole- 

 optera, but forming a peculiar 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 

 nervures ; maxillae 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. 



