482 INSECTA. 



cated at the end and do not cover the posterior extremity of the 

 abdomen. The maxillary palpi are salient, and terminated by a 

 larger and triangular joint. The legs are short. This genus does 

 not belong to the Tetramera, as I formerly thought, but to the Hete- 

 romera. The penultimate joint of the tarsi is bilobate. I have 

 established this division on an Insect, found in Scotland in a shop, 

 which was sent to me by Dr Leach. 



The second tribe, that of the Pyrochroides, approaches 

 the first in the tarsi and the anterior elongation and narrowing 

 of the body, but it is flattened, and the thorax is almost orbi- 

 cular or trapezoidal. The antennae, at least in the males, are 

 pectinated or plumous en panache; the maxillary palpi are 

 slightly serrated, and terminated by an elongated and almost 

 securiform joint; the labial palpi are filiform ; the abdomen is 

 elongated, entirely covered by the elytra, and rounded at the 

 extremity. 



These Heteromera, which are found in the spring in woods, 

 and whose larvse live under the bark of trees, form the genus 



Pyrochroa, Geoff. Fab. Dej. Lampyris, Lin. 



Those species, in which the antennae are almost as long as the 

 body in the males, and give off long bearded filaments; where the 

 eyes, in the same sex, are large and approximated behind; where 

 the thorax is in the form of a truncated cone, or is trapezoidal; and, 

 finally, where the body is proportionally narrower and more elon- 

 gated as well as the legs, constitute, the genus 



Dendroides, Lat. Pogonocems, Fisch.(l) 



Those, in which the antennae are simply pectinated and shorter, in 

 which the eyes are remote from each other, and the thorax is almost 

 orbicular and transversal, form the genus 



Pyrochroa properly so called(2). 

 In the third tribe, that of the Mordellon^e, so far as re- 



(1)1 had established this genus on an Insect from Canada, which formed part 

 of the collection of M. Bosc, that closely approximates to the Pyrochroa flabellat a, 

 Fab. M. Fischer has made the same generic section, under the denomination of 

 Pogonocerus, from a second species thoracicus discovered in southern Russia. 

 The figure of it, given by him in the Mem. of the Nat. of Mosc, is reproduced in 

 the first volume of his Entomog. Imp. Russ. 



(2) See GeofFroy, De Geer, Fabricius, Latreille, Schcenherr, &c 



