276 ENTOMOLOGICAL NE\VS [Nov., '22 



punctate, shining and but for a few coarse hairs between the coxae, 

 naked. Meso- and metasternum punctate and hairy, hairs depressed, 

 where the legs cover these sclerites in repose there are no hairs. Legs 

 hairy. The hairs on under surface of body and legs are finely plumose 

 and not as long as those on the thorax and elytra. Length 1.5 mm.; 

 width 1 + mm. 



Described from an unique in the collection of Dr. E. C. Van 

 Dyke, who collected it in the Yosemite Valley, California, and 

 in whose collection the type remains. 



Hetaerius pilosus n. sp. 



Form broadly quadrate oval, ratio of extreme length to breadth, three 

 to two. Color fulvo-ferruginous. Shining throughout. 



Head at vertex very slightly concave ; finely, closely punctate, minutely 

 rugose between the punctures which deadens the surface lustre on 

 vertex and front, punctures with long, curved, golden yellow hairs ; 

 labrum and epistoma shining but minutely rugose. 



Thorax twice as broad as long ; disc smooth, shining, moderately 

 punctate each with a long, very fine, curved, yellow hair. Bulla punc- 

 tate and hairy on outer two-thirds, inner surface smooth and shining. 

 Transverse sulcus deep and broad at bottom. Lateral area punctate 

 and hairy ; these hairs and those on bulla coarser than those on the 

 disc ; oblique sulcus carinate on both sides to base of elytra. 



Elytra smooth, shining, evenly, moderately punctured, punctures fine, 

 each one bearing a long, fine, curved, suberect hair which tapers to a very 

 fine, long point. First dorsal stria extends three-fourths the distance 

 to the tip of elytra; all the others reach apex; striae fine. 



Pygidium smooth, shining, impunctate ; propygidium smooth, shining, 

 punctate, punctures more widely dispersed than on upper surface of 

 body, each with a long pilose hair. 



Prosternum of the depressed type; carinae of the margined area con- 

 vergent between the coxae, thence gradually divergent to one-half 

 the length of prosternum at which point they converge in a nearly 

 straight line meeting in a sharply rounded tip, thus closing area in 

 front ; surface of margined area minutely acinose ; remainder of 

 prosternal surface punctate and acinose, punctures without hairs ; 

 cephalic apex of prosternum slightly emarginate and broadly depressed 

 at tip of ridge. Meso- and metasternum and abdominal segments smooth, 

 shining, impunctate. Legs smooth, shining and rather widely punctured, 

 punctures with short hairs. Length 2 mm.; width 1.5 mm. 



A single example taken in the nest of a small dark ant at 

 Cypress Ridge, Marin County, California. Type in my own 

 collection. 



This species is close to helcnac Mann from Mexico but, 

 according to Mr. H. C. Fall, who kindly compared it with the 



