40 PROCEEDINGS OF THE NATION.\L MUSEUM. vol.61. 



metatarsus; abdomen about twice as long as broad, and nearly as 

 long as the thorax; first tergite broadening posteriorly, as broad 

 at apex as long, entirely rugose; second tergite transverse, nearly 

 three times as broad as long, longer than the third, entirely rugose, 

 and separated from the third by a sharp crenulate suture that dis- 

 tinctly curves forward laterally; third tergite distinctly delicately 

 aciculated on the basal two-thirds ; remainder of tlie abdomen smooth 

 and shining; ovipositor sheaths narrow, about half as long as the 

 abdomen. Black; mouthparts, including labial palpi and the two 

 basal segments of the maxillary palpi, black ; antennae, tegulae and 

 wing-bases black; wings very weakly fuliginous, the median cell 

 hyaline; veins and stigma brown, the latter without a pale spot at 

 base; all coxae and troclianters black; fore and middle femora black 

 on the basal half; posterior femora dark reddish-brown, tinged with 

 blackisli, remainder of the legs mostly yellowish-brown; abdomen 

 wholly black. 



Male. — Like the female, except that the antennae are longer than 

 the body, the abdomen is more slender, the posterior femora are 

 entirely black, and the mesoscutum is not so distinctly punctate pos- 

 teriorly. 



Type locality. — Tuolumne Meadows, Soda Springs, California. 



ry/?e.— Cat.No. 23996, U.S.N.M. 



Described from one female and one male taken by G. R. Pilate at 

 tlie above locality, August 8, 1916. 



24. MICROGASTER PHTHORIMAEAE, new species. 



Closely resembles congregatiformis, from which it differs in want- 

 ing the prominent median facial carina, in the black tegulae, in the 

 shorter and narrower ovipositor sheaths, and in wanting the con- 

 spicuous dusky spot on the fore wing just below stigma. 



Female. — Length 3.3 mm. Face closely punctate, with a more or 

 less distinct shining median tubercle below antennal fossae, but with- 

 out a strong median carina ; vertex practically impunctate, polished ; 

 temples very weakly punctate and shining; antennae about as long 

 as the body; mesoscutum closely shallowly punctate anteriorly, im- 

 punctate and polished behind; scutellum flat, impunctate, polished; 

 mesoj)leurae highly polished, and without a crenulate furrow, but 

 with a dimple-like impression posteriorly ; propodeum coarsely 

 rugose, with a prominent median longitudinal carina; metapleurae 

 coarsely rugose; stigma subequal in length with the metacarpus; 

 radius curved, directed outward; coxae half as long as the thorax, 

 mostly polished, with an elongate flattened punctate area on the outer 

 upper edge at base ; inner spur of middle tibiae as long as the middle 

 metatarsus; inner spur of posterior tibiae much more than half as 

 long as the posterior metatarsus ; abdomen broad, not quite as long 



