140 MISC. PUBLICATION 17 4, U.S. DEPT. OF AGRICULTUKE 



carina at bottom of the depression ; mandibles eacb with 3 teeth, the outer tooth 

 slightly longer and more acute than the other 2 ; maxillary palpi composed of a 

 single joint, about 5 times as long as wide at base, blunt at apex, with 3 apical 

 setae, and another long seta located a little before the middle of joint; labial 

 palpi also 1-jointed, about twice as long as broad and with about 3 unequal 

 spines at apex ; whole head with rather fine weak sculpture. Antennae 9-jointed, 

 weakly ciavate, inserted a little above the lower extremities of the eyes, and 

 clothed with brownish hairs ; scape about as long as pedicel, ring joint, and first 

 funicle joint, slightly compressed and a little curved ; pedicel a little more than 

 twice as long as thick at apex ; 1 transverse and very short ring joint ; funicle 

 3-jointed, the first joint nearly iy 2 times the length of pedicel and of about the 

 same thickness as pedicel; second funicle joint about equal to pedicel, third a 

 little shorter than second; club pointed ovate, 3-jointed, not longer than the 2 

 preceding joints together, distinctly a little thicker than the funicle joints and 

 terminating in a short spine ; elongate sensoria unusually prominent, occurring 

 in a single more or less irregular series on each of the funicle and club joints 

 and appearing as low carinalike processes the apices of which project somewhat 

 from the surface of the segment. Thorax finely lineolate or reticulate ; pro- 

 thorax short, obconic, sparsely hairy posteriorly; mesoscutum broader at the 

 tegulae than long down the middle, the parapsidal grooves deep and complete, 

 the middle lobe (prescutum) with a very fine but distinct median longitudinal 

 suture and bare except for a distinct row of hairs along each side near the 

 parapsidal grooves; lateral lobes (scapulae) sparsely hairy; scutellum strongly 

 convex, rounded posteriorly, with 2 distinct longitudinal grooves dorsally, 

 bare except for 2 moderately long hairs on each of the dorsolateral sclerites ; 

 axillae widely separated, advanced forward along the parapsidal groove for 

 nearly half the length of the groove; propodeum very short medially, longer 

 laterally, with a weak median carina but without lateral folds or spiracular 

 sulci and weakly reticulately sculptured; pleura reticulated. Legs normal; 

 tarsi 4-jointed ; hind coxae faintly reticulated ; hind tibia with 1 spur which 

 is very slightly shorter than the first tarsal joint ; middle tibial spur a little 

 longer than first tarsal joint. Wings well developed ; fore wing extending well 

 beyond apex of abdomen, a little more than twice as long as broad, bare 

 basally behind the submarginal vein, except for a transverse row of hairs 

 running obliquely proximad from the base of marginal vein and joining a 

 longitudinal row which parallels the posterior margin of wing; marginal cilia 

 short; marginal vein longer than submarginal, about 4 times as long as 

 stigmal ; postmarginal vein absent or represented by a very short stub ; sub- 

 marginal vein with 2 to 4 erect short hairs dorsally. Abdomen as broad or 

 somewhat broader than thorax, about as long as head and thorax together, 

 broadly ovate with the apex acute ; weakly reticulately sculptured, the tergites 

 except the first sparsely hairy; ovipositor not exserted. Head and thorax 

 metallic blue or green, often more or less aeneous ; oral margins, mandibles, 

 and other mouth parts yellowish ; antennae, including scape, brownish black : 

 coxae concolorous with pleura ; femora often wholly pale yellow but fre- 

 quently all 3 pairs marked with a broad fuscous or blackish patch or band 

 which, in some cases, embraces half or more than half the segment; tibiae 

 and tarsi, except apical tarsal joint, pale yellow; abdomen aeneous black: 

 wings hyaline, venation dark brown. 



Male. — Length 1.5 mm. Antennae nearly two thirds as long as body, not 

 ciavate, 10-jointed with one ring joint; scape compressed, about two and 

 one half times as long as broad; pedicel one and one half times as long as 

 thick ; funicle 4-jointed, the joints narrower at apex than at base, somewhat 

 vase shaped, each with a whorl of very long hairs which extend to or beyond 

 the apex of the following segment; first joint the shortest, about equal to 

 pedicel ; second, third, and fourth joints subequal, each about three times 

 as long as their greatest breadth ; club 3-jointed, the joints not so distinctly 

 separated as those of funicle ; the first and second joints each with a whorl 

 of long hairs, subequal in length, shorter than the funicle joints ; apical joint 

 a little shorter than preceding, with a few shorter hairs, and terminating in 

 a blunt spine or process at apex. Abdomen not longer than thorax, convex 

 above, not acute at apex. Color and other characters as in the female. 



Described from 84 specimens reared in America and 9 reared in 

 Europe from the hessian fly. Details regarding this material are 

 given in the discussion under the review of literature. 



