84 



FAMFLY II. CAEABID.E. 



110 (459). Tachys FKRRiciNEUs Dej.. Spec. A'. 1831. 59. 



Robust, strongly convex. Uniform reddish-brown, shining, often trans- 

 lucent ; antenn;ie dusky, paler at base. Thorax one-half wider than long, 

 sides slightly curved in froiit. feebly sinuate behind; hind angles rectangu- 

 lar, not carinate. Elytra more than one-half wider than thorax, with a 

 deep sutural and a tiner abbivvinted second stria, rarely with traces of a 

 third. Length 2.5-3.2 mm. 



Sonthorii lialf of State; frequent; mneh less so northward. 

 Ai)ril 17-iMay 2S. Occurs usually in the nests of ants, though some- 

 times beneath chunks in clamp localities. 



Group B. 



In this group the mentum is marked behind the median tooth 

 with two large deep punctures. Five species are known from the 

 State. They comprise the Indiana species of Groups V-IX of 

 Ha V ward. 



Fig. 54. n, Front tarsus of T. prnxinnis (male); 6, 

 antenna of T. lavus: c, front tarsus of T. corruscus 

 (male.) (After Hayward.) 



KEY TO INDIANA SPECIKS OF GROl'P 15. 



ii. Klylra with the iiiargiual slria broadly interrupted at middle (obsolete 

 in hrrtis i . 

 b. Uecurved portion of the sutural stria very short, parallel with the 

 suture, not hooked at tip: two dorsal punctures on the third in- 

 terval near the third stria : form depressed; length 1.2-1.5 mm. 



111. LuEVUS. 



hi). liecurved iiortion oi the sutural stria long, nearly parallel to the 



suture, distinctly hooked at tip; the first dorsal puncture on fourth 



intervjil. the second enclosed within the recurved poi'tion of the 



sutural stria ; length 2.3-3.2 nun. 



c. .M;ile with th(> first two Joints of the front tarsi dilated (Fig. 



51, ti) : elylra ol)long-ova 1. pale witli an ill-defined dark blotch 



behind the middle. 112. proximis, 



cv. yi-.tlv with only tlie basal .joint of the front lai'si dilated (Fi.g. 



54, c). 



ti. Males with the inner angle of the dilated .joint of front tarsi 



without .-I sjiine: color more reddish than in proximuf^. with 



the dark blotch of elytra better defined, frequently extending 



to the margiu. J13. scitulus. 



