xxxiii, '22] ENTOMOLOGICAL NEWS 291 



Prosternum of the same type as in sctosus but with the margined 

 area narrower and the general surface less convex; cephalic margin 

 more deeply emarginate and with a more pronounced prosternal pit. 



Pygidium and propygidium evenly, moderately punctured and with 

 the same type of hairs as on upper side of body. Legs on outer surface 

 and remainder of under surface the same. Length 2 mm.; width 1.5 mm. 



Described from five specimens taken by Mr. Henry Dietrich 

 at North Fork, California, in the nests of Formica plicicornis? 

 Type in my collection, paratypes in that of Mr. Henry Dietrich. 



This species while close to setosns is distinct in the characters 

 given above. The hairs are so minute as to give it a naked 

 appearance when compared with that species. 



Hetaerius dietrichi n. sp. 



Form quadrate oval ; ratio of extreme length to width as seven and 

 a half to five plus; color ferruginous. 



Head at vertex nearly flat, where it is coarsely punctate and rugose ; 

 punctures with squamose, suberect hairs, a few of which near thorax 

 are twice as long as the others, all being plumose ; front and labrum 

 punctate and rugose, shining. 



Thorax less than twice as broad as long ; discal area smooth, shining, 

 thickly punctate in front, but becoming less so at base, punctures with 

 short, small, yellow hairs ; lateral area more coarsely punctured, hairs 

 of the same type as on the disc; bulla slightly smaller in proportion 

 to lateral area than usual ; transverse sulcus broad and shallow, be- 

 coming more narrow toward the oblique sulcus ; outer half of bulla 

 coarsely punctate and hairy. 



Elytra smooth, shining, finely punctured, punctures with short minute 

 hairs ; first and second dorsal striae reaching three-fourths the distance 

 to apex. 



Pygidium and propygidium shining, minutely rugose and very finely 

 punctate with minute hairs in the punctures. 



Prosternum closely punctate and rugose with short minute hairs in 

 the punctures ; margined area with carinae convergent between the 

 coxae, thence divergent to less than half the length of prosternum, where 

 they converge toward a common point, in some cases very nearly meet- 

 ing but in the majority of cases well separated, leaving margined area 

 open in front. Meso- and metasternum shining, less closely punctured 

 than prosternum, punctures with short, minute hairs. Outside of legs 

 sparsely punctate, the accompanying hairs coarser and evidently plumose. 

 Length 1.5 mm.; width 1.25 mm. 



Described from six examples taken by Mr. Henry Dietrich 

 at Dalton Creek. Fresno County, California. .T have also a 

 single example which I am unable to separate from the above 



