436 



FAMILY XI. STAPH YLHSTIDiE. 



well as that of thorax, densely and strigosely punctate. Thorax three- 

 fifths as wide as head, median smooth line narrow. Elytra one-third wider 

 but not longer than thorax. Abdomen at base as wide as elytra. Fifth 

 ventral of male with t wo small ^tubercles on hind margin. Length 3.7^ mm. 



Kosciusko County; rare. June 25. Sifted from vegetable 

 debris at edge of tamarack swamp. A member of the boreal fauna. 



S. tristis Melsh., 5.5-7 mm. in length, has been taken near Cin- 

 cinnati and ranges from Pennsylvania to Arizona. If doubtless oc- 

 curs in southern Indiana. 



LIV. Megastilicus Casey. 1889. (Gr., "large + style.") 



This genus was erected by Casey upon a very stout form with 

 a small orbicular head, having the body, especially the margins, 

 thickly clothed with short, stiff bristles. 



835 (9650). Megastilicus formicarius Casey, Entom. Amer., V, 1889, 183. 

 Dark reddish-brown, opaque ; head and abdomen piceous. Head nearly 



circular, not punctured but coarsely alutaceous ; neck exceedingly small ; 

 antennae reaching base of thorax, stout, the joints closely united. Thorax 

 slightly longer than wide, widest one-third from apex, the sides thence 

 rapidly converging to apex, nearly straight to base; disk coarsely alu- 

 taceous, the median line smoother. Elytra three-fourths wider and one- 

 third longer than thorax, finely, sparsely and roughly punctate. Abdomen 

 short and broad, strongly margined, less than one-half longer than elytra, 

 finely and densely punctate. Length 5 mm. 



Putnam and Spencer counties ; rare. April 9-June 13. Occurs 

 in the large cone-shaped nests of ants, especially those of Formica 



exsectoides. 



LV. Leptogenius Casey. 1905. 



Minute reddish-brown species having the eyes very small; la- 

 brum with four teeth; antennae extremely short, not longer than 

 head; neck about one-fifth as wide as head; thorax obliquely nar- 

 rowed in front. Two species occur in the Eastern United States, 

 one of which has been taken in Indiana. 



836 (9G57). Leptogenius brevicornis Casey, Trans. Acad. Sci. St. Louis, 



XV, 1905, 247. 



Slender, subparallel, feebly convex. Pale reddish-brown, closely, coarsely 

 and rugosely punctate ; elytra somewhat darker. Head longer than wide, 

 its sides parallel. Thorax three-fourths the width of head, about as long 

 as wide, base twice as wide as apex, median line feebly carinate Elytra 

 together as long as wide, one-third wider and a fourth longer than thorax. 

 Abdomen as wide as elytra. Length 1.7 mm. 



