LeConte.J 



TROPIDERINI. 393 



3. Sides of beak not dilated; antennae very long ischnoe«ri. 



" " dilated over the autennal cavities Tropideres. 



Group I. isclinocerl. 



Beak longer than the head, dilated at tip; antennal cavities large, lateral, 

 limited above by a small, elevated line, which descends to the inferior mar- 

 gin of the eyes. Eyes longitudinal, elliptical, rather coarsely granulated. 

 AntenniE very slender, longer than the body in J^; two-thirds as long in 

 $ ; first joint very short; second twice as long as first, and more than one- 

 half as long as third; 9-11 broader, forming a compressed, loose, oval club. 

 Tarsi with the first joint long; second triangular, emarginate, with pro- 

 longed angles; third as wide as the second, bilobed; claws armed with a 

 long, acute tooth at the middle. 



ISCHNOOERUS Schdnh. 



1. I. infuscatus Fahraeus, Sch. Cure, v, 192; Meconemus tuiercidatus 

 Imhoff and Labram, Gen. Cure. 1, 40. 



Mexico, extending into the Southern States as far as South Carolina. 

 In the Mexican specimens the pubescence is som?what paler and more 

 •dense; it is Isclinocerihs macrocerus of Dejean's Catalogue. 



This is a narrow species, with the base of the prothorax truncate; there 

 is a trace of a second transverse raised line between the base and the ante- 

 basal ridge ; the latter is situated about one-fifth from the base, slightly 

 sinuate, and forming an obtuse angle at the middle; flexed obliquely for- 

 wards on the side, where a distinct lateral angle is formed behind the middle. 

 The pubescence is yellowisli brown, mixed with pale gray, and does not 

 exhibit any distinct pattern. Length 6.8-10 mm. ; .27-.40 inch. 



Group. II. Troplderes. 



The sides of the beak in the insects of tliis group are dilated over the 

 an'ennal cavities, which are therefore not visible from above. The form 

 of the antebasal ridge differs in each genus, and in conjunction with the 

 antennal club and tarsal claws affords easy characters for distinguishing the 

 genera. The eyes are entire, either rounded or oblique. 



Antennal club narrow, not compressed . 2. 



" " oval, compressed 3. 



2. Pro'horacic ridge strongly angulated and touching 



the base at the middle ; claws ?.\m\i[e GONOTROPIS. 



Prothoracic ridge straight at the middle, base deeph' 



biemarginate ; claws acutely toothed EURYMYCTER. 



3. Eyes oblique, slightly oval, beak short TROPIDERES. 



Ej'es rounded, beak longer, antennae (^ very long.. ALLANDRUS. 



GONOTROPIS n. g. 

 Body rather robust and convex. Beak longer than the head, gradually 

 nari'owed to the middle, then widened to the tip, which is truncate with 



PROC. AMER. PHILOS. SOC. XV. 96. 2x 



