AMERICAN HYMENOPTERA. 135 



A 9 , June 26, 1907 (S. A. Rohwer) , has the legs somewhat 

 lighter color and the apex of the abdomen is the same color 

 as the legs. The basal rufous spot of the abdomen is not so 

 distinct. 



Lysiphlebus crawfordi n. sp. 



Female. — Length 2 mm. Antennas 13-jointed, rather sparsely 

 covered with short, straight hair; second joint globose, shorter than 

 the first, and about twice as wide as the following one; third joint a 

 very little shorter than the fourth; apical joint (22 u.) almost or quite 

 twice as long as the preceeding one, which is 11 u.; apical joint acute 

 at the apex. Maxillary palpi three-jointed; joints cylindrical, apical 

 joint much longer than the preceding one. Labial palpi three-jointed, 

 short, joints subglobose. Two spurs on middle tibiae about equal 

 jength; basal joint of middle tarsi not quite as long as the two following 

 united; apical joint (10 u.) not quite as long as the two preceding 

 united. Spur of hind tibiae rather strongly curved, basal joint of hind 

 tarsi longer than the two following united but not as long as 2, 3 and 

 4; apical joint (10 u.) not much longer than the preceding joint. 

 Tibias apically and all the tarsi joints with short, straight hairs. Claws 

 simple; pulvilli large. Venation in dry specimens normal for genus 

 Lysiphlebus. In specimens mounted in balsam the stigma and radius 

 become very indistinct, in and the transverse cubitus is wanting. The 

 specimens in balsam run to Lipolexis Forster. Abdomen elongate. 



Color or dry specimens: Black, not very shiny; mandibles, fore legs 

 entirely, four posterior legs below basal part of coxae, and in some 

 specimens the entire legs brownish-yellow. The hind legs are some- 

 times very strongly brownish, especially the femora and tibiae. Wings 

 hyaline, slightly iridescent; basal nervures pale brown, stigma and 

 radius white. 



Color of specimens mounted in balsam: Head, thorax and antennae 

 dark brown; abdomen and legs much lighter brown; entire anterior 

 legs, coxae, trochanters, knees and tarsi flavous. Wings hyaline; 

 basal nervures pale brown; stigma and radius very faint whitish. 



Male. — -Length 2 mm. Antennas sixteen-jointed; apical joint the 

 same length as the preceding, although it appears somewhat shorter, 

 length 10 u.; apical joint is set close to the fifteenth, not well separated 

 as the preceding ones are, but nevertheless quite distinct, tapering 

 for the greater part of its length to a rather acute apex. Apical joint 

 of the middle tarsi 9 u., distinctly longer than the preceding one. 

 Apical joint of the hind tarsi 10 u. 



Color as in female. 



Habitat. — Breed from Myzus persicce collected at Phoenix 

 Arizona, March, 1908, by J. E. Coit. The aphid is said to 

 infest all kinds of plants. 



In Ashmead's table for the species of Lysiphlebus (Proc. 

 760 of U. S. Nat. Mus. 18SS, p. 662 and 663) the female 



TRANS. AM. ENT. SOC, XXXV. MARCH, 1909. 



