118 INSE;CUT0R INSCITI^ MENSTRUUS 



Type, Cat. No. 20459, U. S. Nat. Mus., the female on a tag, 

 the head on a slide. 



Isodromus abnormicornis, new species. 



Female. — Somewhat smaller than pidcher and differing from 

 it generically in that the antennae bear a large ring-joint as in the 

 Pteromalidas (besides the extremely short one usually present), 

 the funicle 5-jointed ; also the teeth of the mandibles are spread- 

 ing and larger, the middle the largest; the marginal vein is 

 slightly longer than wide, the postmarginal only somewhat 

 shorter than the stigmal, hence rather long. 



Pale lemon yellow, the vertex and dorsal thorax orange yel- 

 low, the wings with a smoky band across from the side of the 

 stigmal vein (but faint caudad). The following black parts: 

 Face of pronotum, caudal margin of same except laterad (some- 

 times) mesal half of each axilla (brown), (sometimes) distal 

 half of scutellum (brown), propodeum, mesopleurum and dis- 

 tal half of the abdomen ; also the hind tibise. Tarsi white. Head 

 densely, finely punctate, the dorsal thorax densely scaly and 

 with moderately dense pubescence, the axillae with a carina be- 

 tween them, the propodeum with three rather widely separated 

 carinse at the meson. Lateral ocellus just not reaching the 

 eyes. Ovipositor free for its distal half, its valves apparently 

 absent, the abdomen blunt at apex (tipped by the valves in 

 pulcher). Funicle 1 subequal to the pedicel, somewhat longer 

 than wide, 5 distinctly wider than long. Caudal tibial spur 

 single, long and slender as in pulcher. Face not inflexed, the 

 head lenticular, longer than wide (quite as in pulcher). Frons 

 moderate. 



The male is similar but the wings are hyaline, the cephalic 

 third of the mesopleurum is yellow, the legs white except the 

 purple hind tibiae at base broadly and a little beyond the mid- 

 dle. Also the antenna is less capitate, the funicle filiform, its 

 joints subequal, all a half longer than wide. Type of pulcher 

 compared. 



From several pairs reared from Icerya brasiliensis, Sao 

 Paulo, Brazil (A. Hempel). 



