1903.] NATURAL SCIENCES OF PHILADELPHIA. 569 



behind; basal joint of hind tarsi with a suffused black stripe behind; 

 small joints of tarsi more or less reddish; wings strongly yellowish- 

 smoky, nervures fuscous, stigma ferruginous; second submarginal cell 

 quadrate, receiving the recurrent nervure at its middle; basal nervure 

 meeting transverso-medial ; abdomen rather broad, yellow, minutely 

 roughened ; basal half of first segment (a little produced in middle line), 

 and broad bases of second and third segments, jet black ; venter yellow, 

 second segment, and a reversed V on first, black. 



Hab. — Los Angeles county, Cal. (CoquiUett). In U. S. Nat. Museum. 

 Named after the well-known hymenopterist of that institution. The 

 spots on the metathoracic enclosure suggest A'^. decempunctata, but that 

 is smaller and has a different venation. 



Nomada (Phor) subgracilis, sp. n. 



6^ . — Length about 5 mm. ; head and thorax densely punctured, with 

 Avhite hair; eyes gray; mandibles except tips, labrum, rather broad 

 anterior margin of clypeus, and triangular lateral face-marks (coming 

 to a very fine point somewhat below level of antennae), all pale yellow; 

 scape rather stout, dark reddish-brown, roughened, hairy; flagellum 

 pale ferruginous beneath, black or nearly so above, apical margins of 

 basal joints projecting above; third antennal joint about or slightly 

 over half length of fourth; thorax black with a pallid spot on tubercles, 

 but no other light markings; tegulse dark red, punctured; legs dark 

 brown, the first four yellow in front; wings dusky at apex, stigma red- 

 dish; marginal cell long; second submarginal little narrowed above, 

 and receiving the recurrent nervure at its middle ; basal nervure end- 

 ing some distance basacl of transverso-medial ; abdomen finely rugoso- 

 punctate, dark brown; first segment with an oblique pallid stripe on 

 each side, and an obscure spot mesad of each ; second to fifth segments 

 with more or less interrupted bands, w^hich are broadened and pale 

 yellow laterally, but narrow and become suffused with reddish toward 

 the middle; on the third to fifth segments these bands are interrupted 

 sublaterally by large dark brown spots; sixth segment with a pale 

 yellow entire band failing laterally; apical plate large, entire, with a 

 distinct rim; venter brown. 



i/a6.— "Cala.," one in Coll. Acad. Nat. Sci. Phila. Mr. Viereck tells 

 me it was confused with A^ gracilis (from which it differs in venation) 

 in the collection. 



The remaining species are referred to the restricted genus Nomada, 

 as understood by Robertson. I liave not seen any species of Gnathios 

 from California. 



