AMERICAN COLEOPTERA. 105 



PITBTUS Gorham. 



Mouth parts substantially as. in neighboring genera; eyes small. 

 truncate beneath. Antenna? 9-jointed ; first joint thickest, oval ; 

 2-8 narrower and gradually shorter, the outer ones nearly as wide 

 as long; ninth joint obovate, equal to the two preceding united, and 

 nearly as wide as the first. Prothorax without distinct ante-basal 

 constriction. Scutellurn wanting. Elytra ventricose, punctate stri- 

 ate. Front and middle coxa? distinctly separated ; hind coxa? very 

 distant, the trochanters reaching the elytral margin. Metasternurn 

 subequal in length to the second ventral segment, broadly roundly 

 emarginate behind. Ventral segments 1-3 subequal in length at 

 the middle, the first shorter at sides; fourth very short, arcuate, 

 embracing the fifth at sides, the latter cordate and a little longer 

 than the third. Legs moderate in length, rather slender, thighs 

 feebly clavate. Tarsi not laterally compressed, fifth joint subinthi- 

 ted, slightly wider than the fourth, and inserted at its apex ; claws 

 divaricate. 



The single and singular species upon which this genus is founded 

 is remarkable as being the smallest of the family. The antennal 

 structure is unique. 



P. pygmseiis Gorh. — Black ; head and prothorax alutaceous, dull ; elytra 

 feebly shining. Front rather narrow, but not carinate between the antennal 

 fovea?; antennae at base nearer to the eyes than to each other. Prothorax as 

 wide as long, sides parallel and broadly arcuate, hasal constriction feeble and con- 

 sisting of a marginal impression which is better defined at sides. Both the head 

 and prothorax are rather coarsely but not closely punctured and with scattered 

 short pale recumbent hairs. Elytra oblong-elliptical, twice as wide as the pro- 

 thorax and about two and one-half times as long; punctate-striate, the punctures 

 coarse and closely placed, and each bearing at its anterior margin a short, stout. 

 recurved hair, which lies across the puncture; interspaces scarcely as wide as 

 the strial punctures, impunctate and glabrous. Beneath glabrous and almost 

 impuuctate. Length 1 mm. 



Described from Guatemala. The specimens before me were taken 

 by Mr. Beyer in the cape region of Lower California. 



TRIGONOGENIUS Solier. 

 Mentum nearly as wide as long, carinate and subacuniinate in 

 front, feebly impressed behind ; palpi as usual ; labrum emarginate. 

 Eyes small, rounded, a broad segment beneath clothed with scales 

 making them appear truncate just below the middle. Antenna? 

 slightly longer than half the body, their point of insertion nearer to 



TRANS. AM. ENT. SOC. XXXI. (14) MARCH, 1905. 



