84 



FAM FLY II. CAKA'BIDiE. 



110 (459). Tachys feerugineus Dej., Spec. V, 1831, 50. 



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

 lucent ; antenna* dusky, paler at base. Thorax one-half wider than long, 

 sides slightly curved in front, feebly sinuate behind ; hind angles rectangu- 

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

 deep sutural and a finer abbreviated second stria, rarely with traces of a 

 third. Length 2.5-3.2 mm. 



Southern half of State; frequent; much less so northward. 

 April 17- May 28. Occurs usually in the nests of ants, though some- 

 times beneath chunks in damp 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 

 Hay ward. 



Fig 54. a, Front tarsus of T. proximus (male); b, 

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

 (male.) (After Hay ward.) 



KEY TO INDIANA SPECIES OF GROUP B. 



a. Elytra with the marginal stria broadly interrupted at middle (obsolete 

 in IcDvus). 



b Recurved 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. L^VUS. 



Recurved portion of the sutural stria long, nearly parallel to the 

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

 interval, the second enclosed within the recurved portion of the 

 sutural stria ; length 2.3-3.2 mm. 

 c. Male with the first two joints of the front tarsi dilated (Fig. 

 54 a) • elytra oblong-oval, pale with an ill-defined dark blotch 

 behind'the middle. H 2 - pboximus. 



cc. Male with only the basal joint of the front tarsi dilated (Fig. 

 54; c). 



a Males with the inner angle of the dilated joint of front tarsi 

 without a spine; color more reddish than in proximus, with 

 the dark blotch of elytra better defined, frequently extending 

 to the margin. 113 - scitulus. 



