12 GEO. H. HORN, M. D, 



usual sinuous bands and a juxta-scutellar basal spot yellow. Antennae brown, 

 tbe basal joints pale. Head piceous, densely punctulate. Thorax twice as wide 

 as long, sides arcuate, base arcuate, slightly oblique each side, the marginal line 

 distinct, disc moderately convex, densely punctulate, color piceous or brown, 

 the sides indefinitely paler. Elytra parallel, more or less substriate, densely 

 punctulate, color brown to piceous, the usual two sinuous bands more or less 

 interrupted and often indistinct, a recurrent lunule near the apex and a juxta- 

 scutellar spot. Epipleurse pale. Body beneath piceous, the side of the protho- 

 ras, tip of prosternum, sides and apex of abdomen indefinitely, yellow. Meta- 

 sternum with distinct mesocoxal line curved with the convexity anteriorly. 

 Abdomen densely finely punctulate. Legs entirely yellow. Length .10— .18 

 inch. ; 2.5—4.5 mm. PI. 1, figs. 7-8. 



Male.— Lahr am broader than long, arcuately narrowed to apex and with a 

 slight emargination at middle. Mandibles moderately prominent, the teeth 

 small, at base ou outer side a prominent lobe which forms a more or less distinct 

 angulation at its front end. Front oblique, not retuse. Thorax as wide as the 

 elytra, slightly narrowed in front. 



Female. — Labrum similar in form to the male, but not as narrow in front. 

 Mandibles more robust, the entire basal lobe arcuate, not forming a prominent 

 angle in front. Thorax a little narrower than the elytra, narrowed in front. 



Variations. — The general color has already been referred to. In 

 the darker forms the sides of thorax are not completely bordered 

 with yellow. The elytra are often without any trace of striae and 

 atyaiu very plainly striate. The sinuous bands in their extent and 

 interruption vary here as in every other species. 



Along the Gulf region from Florida to Texas, and even Arizona, 

 a form occurs which is nearly as small as pusillus, and without some 

 care would be mistaken for that. It is quite pale in color and the 

 sinuous bands are so extended as to leave but a small region along 

 the suture somewhat darker in color. The contrast between the 

 larger forms of coUaris and these small forms is so pronounced that 

 with limited material one would be justified in giving it a distinct 

 name, but with a series of one hundred and twenty specimens before 

 me with all gradations of size in color I feel satisfied that they are 

 all one variable species. 



The form of coUaris is rather more slender than in the species of 

 its size. The only other species which has at the same time a juxta- 

 scutellar spot and the mesocoxal line is tristis, which has a broader 

 form, piceous tibire, and the mandibles have not in either sex a 

 prominent lobe on either side of base. 



This species has a wide distribution. From Allegheny, Pa. 

 (Hamilton), Ohio (Dury), Illinois (Strumberg), Florida (Schwarz), 

 Texas (Schaupp), New Mexico (Wickham), Arizona (Morrison), 



