212 AMERICAN COLEOPTERA 



the proportionally longer third joint of the antennse and the more 

 numerous, punctured striae of frontalis, and the tripunctate posterior 

 transverse impression of the thorax of the present species. The 

 thorax is also less narrowed behind than in frontalis. 



So far as I am aware it is entirely myrmecophilous in its habits, 

 occurring in the nests of Lasius umbratus Nyl. var. minutus Em. 



It is known to me from Massachusetts, New York, Pennsylvania, 

 the District of Columbia, North ami South Carolina, Ohio, Tennes- 

 see, Iowa and Missouri 



Group V. frontalis. 



Form convex. Head not inserted in the thorax to the eyes; men- 

 turn with two large forameniform punctures behind the tooth ; an- 

 tennse with the third joint slightly longer than the second. Thorax 

 narrowly margined, the margin not translucent. Elytra rounded 

 at tip, with two dorsal punctures on the third stria, the second only 

 slightly behind the middle; recurved portion of the sutural stria 

 nearly parallel to the suture, not hooked at tip; marginal stria 

 broadly interrupted at middle. 



The males have the first two joints of the anterior tarsi slightly 

 dilated. 



This group seems intermediate in many respects between the pre- 

 ceding and the next. With it begins a series having two large fora- 

 meniform punctures on the mentum behind the base of the tooth. 

 These are represented on Plate VI, fig. 13. 



But one species occurs in our fauna. In f'acies it resembles quite 

 closely T. ferrugineus of the last group. 



20. T. frontalis n. sp.— Form convex. Color ferrugineous or rufotesta- 



ceous, shining. Head elongate, as wide as the thorax at apes : frontal grooves 

 loug, deep, extending posteriorly to the hind margin of the eye; eyes moderate, 

 slightly flattened ; autennte about one-half the length of the body, pale fuse.. us. 

 the basal joints more or less testaceous; palpi testaceous. Protborax subquadrate, 

 about one-half wider than long, wider at base than apex ; apex truncate; ante- 

 rior transverse impression distinct, the posterior deep, punctate, not tripunctate 

 at middle; median line distinct, extending between the transverse impressions; 

 basal impressions broad, deep; base truncate; sides with the margin narrowly 

 reflexed. more widely towards the base, arcuate in front, sinuate behind; hind 

 angles rectangular, prominent, not carinate. Elytra more than one-half wider 

 than the thorax, nearly oval, convex, witli a sutural and three abbreviated dor- 

 sal stria- : stria- distinctly punctulate. becoming shorter and less deep externally. 

 the third with the first dorsal puncture about one-fourth from base, the second 

 slightly behind the middle : intervals feebly convex. Body beneath ferrugineous. 

 Legs testaceous. Length .11-. 13 inch : 3.25 3.75 mm. 



