574 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



ocellocular line two-thirds as long as postocellar. Prepectus much 

 more strongly reticulated than rest of mesopleuron ; mesopraescutum 

 wider than long and bearing one row of bristles at each lateral 

 margin, these bristles set in conspicuous pits; submarginal vein of 

 forewing with two or three dorsal bristles; apex of hindwing blunt, 

 fringe at posterior margin one-fourth width of wing at hamuli. 

 Propodeum shagreened and bearing median, paraspiracular, and 

 oblique carinae, as in figure 21, d\ propodeal spiracles almost touch- 

 ing anterior margin ; gaster one-fourth longer than thorax. 



Male. — Unknown. 



Type locality. — Washington, D. C. 



Types.— U. S.N. M. No. 2688. 



Host. — This species is a primary or secondary parasite of argiopid 

 spiders, issuing from the egg sacs. 



Distribution. — District of Columbia, Florida. 



TETRASTICHUS GIBBONI (Girault), new combination 



FIGURE 16, g 



Ootctrastiehus gibboni Girault, Bull. Brooklyn Ent. Soc, vol. 12, p. 86, 1917. 



Head and base of gaster white, yellow, or tan ; thorax brown, with 

 iridescent green reflections; apical part of gaster brown, legs (except 

 bases of metacoxae and apical segments of tarsi) white. 



Female. — Length, 1.3-1.6 mm. Antennae inserted slightly dorsad 

 of level of ventral margins of compound eyes ; apex of scape exceeding 

 level of vertex, pedicel and flagellar segments slender, elongate; three 

 ring segments discernible, first funicle segment one-third longer than 

 pedicel, second and third equal in length and each two-thirds as long 

 as first, club as long as second and third funicle segments combined 

 (fig. 16, 9) ; length of malar space three-fourths height of compound 

 eye; postocellar line one and two-thirds times as long as ocellocular. 

 Mesopraescutum slightly wider than long and bearing only two or 

 three bristles at each lateral margin ; submarginal vein of forewing with 

 two dorsal bristles ; hindwing acute at apex ; fringe at posterior margin 

 one-half width of wing at hamuli. Surface of propodeum smooth, 

 bearing a median carina only; mesal length of propodeum one-third 

 length of mesoscutellum ; propodeal spiracles round, minute, sep- 

 arated from anterior margin by a space equal to diameter of a spira- 

 cle ; minute petiole present, gaster twice as long as thorax. 



Male. — Unknown. 



Type locality. — Tempe, Ariz. 



Types.— U.S.NM. No. 20787. 



Host. — Larvae of the clover stem borer, Languria mozardi (La- 

 treille). 



Distribution. — Arizona. 



