198 AMERICAN HYMENOPTERA. 



45. Larger, abdominal segments depressed at l)asc. Mexican. 



Faiiurginiis inexicaniis (Cr.). 

 Smaller, shining. Californian FauHi*$;iiiiiK atrii'eps (Cr.). 



46. Wings dark fuliginous 48. 



Wings not dark fuliginous Paiiiir^finns spp. 



47. Larger, no shining boss at top of eyes setliiops Cr. 



Smaller, a shining boss at top of eyes fratci'CiilUM Ckll. 



It must be admitted that in several of its parts the above table is 

 unsatisfactory, but I have had it iu use for some time and found it 

 serviceable. The student must remember that these tables are 

 intended to suggest identities rather than proove them, and the 

 detailed descriptions should always be consulted. This is espe- 

 cially to be insisted on in a fauna like our own, containing so 

 many still unde.scribed species. 



25.) Heriades seiniriibra n. sp. 'J, .—Length about 8 mm., l)lai'k, the 

 first three abdominal segments and the extreme sides of the fourth ferruginous. 

 Pubescence white, mostly with a greyish tinge, very abundant on face, hiding 

 the surface ; head round seen from in front; facial quadrangle much longer than 

 broad, the orbits parallel; ocelli in a triangle; cheeks with long dense hair 

 beneath; mandibles hairy at base; apical half dark ferruginous; vertex very 

 closely punctured; antennse ordinary; liagellum dark ferruginous beneath; 

 thorax strongly and closely punctured ; punctures of scutellum somewhat larger 

 than those mesothorax ; base of metathorax smooth and shining; tegulse shining, 

 amber color: wings clear; nervures and stigma piceous; stigma very small, first 

 recurrent nervure reaching second submarginal cell at a point distant from the 

 origin of the first transverso-cubital not more than half the length of the latter; 

 legs black, the tarsi becoming a little brownish at end ; abdomen well punctured ; 

 hind margins of segments pelucid whitish, third segment with a suffused dorsal 

 black patch; lateral hind margins of the segments with white hair, towards the 

 apex there are more or less continuous, but thin and inconspicuous, bands; apex 

 broadly truncate, with a rounded central emargination. this truncate portion is 

 ferruginous; penultimate segment with a small tooth on each extreme side; 

 ventral segments with white apical hair-bands; no subbasal ventral tooth or 

 process. 



Hab. — Southern California, two sent by Mr. Fox. This is by no 

 means a typical Heriades, yet it is not an Ashvieadiella. The 

 resemblance l)etween H. semirubra and Ashvieadiella holt'ii Ckll., 

 ined., is remarkably close, but the latter is smaller, has the end of 

 the abdomen and the hind legs wholly red, besides presenting the 

 characteristic abdominal structure of its genus. The mouth-parts 

 are retracted in the specimens of i/. semirubra described. 



