58 J. L. LECONTE, M. D. 



the base is strongly margined and the disc deeply excavated. In the % 

 the antennae are longer and serrate ; the seventh ventral is cleft to the 

 base, with the eighth narrow and visible for its whole length. The 

 Brazilian Fachymesia Westw., seems to be allied to this genus. 



Black, pruinose with gray pubescence, prothorax yellow, apical lobe of sides 

 well defined, prominent, middle lobe narrow, prominent horizontally, hind lobe 

 straight, equally prominent. Length 3.5 ram.; Pa.; Ga 1. bideiitatus Say. 



Black, prothorax red, anterior margin much less reflexed, and apical side lobe 

 therefore indistinct; middle lobe wide, with its posterior margin straight, and 

 anterior margin convexly curved, liind lobe bent slightly forwards; disc deeply 

 and widely excavated. Length 5 mm.; Gala 2. -: btiisiis Lee. 



Black, pubescent with gray hair, prothorax and side margin of elytra yellow, the 

 former with a very deep discoidal fossa, the apical side lobe indistinct, middle one 

 broad, prominent, with the anterior margin convexly curved, posterior margin 

 straight; hind lobe long, compressed, well separated from the base, emarginate at 

 tip and imguiculate : base truncate, very strongly margined ; ^ . Length 4 5 mm. ; 

 Tex.; Ariz.; Dr. Horn ?>. fossiger n. sp. 



Group 3. — Maltliini. 

 The species of this group are of small size and weak structure, 

 remarkable chiefly for the short elytra, which leaves the wings partly 

 exposed and folded along the dorsal surface of the abdomen. I have 

 modified the group as exposed by me in Classification Col. N. Am., by 

 removing Ti/tthonyx which seems to have no relation to the other genera 

 and to resemble them superficially merely by the abbreviated elytra. 



The wealth of variation in sexual characters is greater in this group 

 than in almost any other in Coleoptera. In Ichfht/urus it afifects the middle 

 legs of the S , and in MnltJwdes the last abdominal segments of both 

 sexes, and the forms of the claspers are ([uite as complex as those repre- 

 sented by Baron R. Osten Sacken in the Tipulidas, with short palpi, Proc. 

 Acad. Nat. Sc. Phila. 1859, pi. 3 & 4. The species are probably numerous 

 but have not yet received much attention from collectors. The European 

 s])ecies, which run somewhat parallel with ours, have been excellently 

 illustrated by the late Dr. H. von Kiesen wetter, Linn. Ent. vii, pi. 2. 

 Palpi with the last joint elongate, securiform; metathoraeic episterna wide in 



front, strongly triangular 2. 



Pal])i with the last joint oval pointed; metathoraeic episterna narrow; claws 



simple .3. 



2.— Claws appendiculate; mandibles toothed.. TRYPHERUS Lee. 



Claws simple LOBETUS Kw. 



:•..— Mandibles toothed, head wide, narrowed behiml MALTHINUS Latr. 



Mandibles simple, head not narrowed behiml MALTHODES Kw. 



TKYPEIEitLS Leo. 



Hy the kindnt'ss of Prof. Westwood, who presented me witli a speci- 

 men of his very singuhir IcJifhi/iirus (h'scoidalis^ I have been enabled to 



