268 Natural History Bulletin. 



the second produced into a narrow, laterally emarginate lobe. 

 Length, i.S mm. Virginia. .... ttlkei. 



Occipital foveae smaller than in ulkci, mutually more distant, 5 

 with the first segment acutely bilobed, the second one broad, 

 lobe overhanging the third segment. Length, 1.7 mm. Illi- 

 nois, Iowa. ..--..- illinoiensis. 

 2* Occipital foveas isolated from the eyes. 



4I Posterior limit of each elytron arcuate in the middle, sinuate externally, 

 3 first dorsal triangularly produced in one broad lobe. Color brown. 

 Length, 1.66 mm. Pennsylvania. .... dentata. 



4* Posterior limit of the elytra straight, pronotum impunctate. 



Black, legs, antennae and palpi dusky yellow, occipital foveae 

 small; abdominal carinre including one-third of the seg- 

 mental width; 3 first dorsal broadl^y arcuated lobed, elevated 

 in the middle of the posterior limit, second transversely con- 

 vex, foveate at the middle posteriorly. Length, i. 2-1.3 mm. 

 Michigan, Illinois, Iowa. .... perforata. 



Brown, head paler, all the fove:e on head and pronotum excess- 

 ively large, i posterior margin of first segment emarginate in 

 the middle: second with a circular impression. Length, 1.3 

 mm. California. - ... . . foveata. 



Yellowish - brown, foveje normal, abdominal fovejE including 

 more than one-third of the width; 5 first dorsal flattened, 

 slightly deflexed, and foveate at the tip, second transversely 

 convex. Length, 1.5 mm. Texas, Louisiana. {$, infinita^ 

 Casey). belfragei. 



Yellowish-red, prothorax sinuate at the sides behind the middle; 

 * first dorsal as long as wide, quadrate, carinae including two- 

 fifths of the width. Length, 1.3 mm. Texas, Arizona. 



texana. 



II. Elytra each with three basal foveolse. Prothorax with large, pubescent 



lateral foveae and a small, wide median one. {^Rctckenbac/na, Leach). 



D. Abdominal carinje including less than one-third of the segmental width. 



No secondary sexual marks on the antennre. 

 i' Abdominal carinte separated by a distance not exceeding that between 

 the sutural lines, and including a rounded, pubescent pad, often 

 covered by the elytra. 

 21 Pronotum punctured. 



' Pronotum evenly thinly punctulate, abdominal carinae short; 

 color at time of copulation, pale umber brown, elytra yellow- 

 ish-red. Later in the year this color darkens. Length, 1.2 



mm. - - - gemmifer. 



Pronotum evenly densely punctate, elytra and dorsal segments 

 regularly punctulate, abdominal carinae very long. Color at 

 time of copulation, dark piceous, elytra slightly paler. 

 Length, i. 3-1.4 mm. Canada, Iowa. - - canadetisis. 



