110 INSECUTOR INSCITI^ M^NSTRUUS 



whereas the distal half of the caudal tibia is dull yellow (in- 

 stead of the tip being abruptly white as in the other). More- 

 over, from occidentalis in that the funicle joints are much 

 longer, 1 twice the length of the pedicel, 3 twice longer than 

 wide. Also, the venation is more yellowish and the post- 

 marginal vein is twice the length of the very short stigmal (as 

 in higelovicc-columhiana) . The caudal femora are not stout. 

 Three ring-joints. 



One female, Washington, District of Columbia. 



Type, Cat. No. 30436, U. S. Nat. Mus., the female on a tag, 

 an antenna, the caudal legs and a fore wing on a slide. 



Briglyptus rohustus Crawford is congeneric and resembles 

 higelovicB closely except that the caudal tibiae are more broadly 

 white at apex and funicle 1 is longer. Bntedonella Girault is a 

 synonym (yet differs in having the spiracle situated in a sulcus, 

 not with a sulcus over and partly around it). 



Tetrastichus malacosomae, new species. 



Female. — Length, 1.15 mm. Like banksi Howard but more 

 slender and the caudal tibia at base is dark or submetallic. Dif- 

 fers notably from that species in having the propodeum at the 

 meson very short, only a little longer than the postscutellum 

 and there with a "median carina" in the shape of a slightly 

 elevated, flat subquadrate area. Moreover, there is no lateral 

 carina on the propodeum and the spiracle is round and near the 

 cephalic margin and of moderate size. Funicle joints subequal, 

 each somewhat longer than wide, the club with a terminal nip- 

 ple. Pedicel somewhat longer than funicle 1. Scape pale but 

 slightly dusky. Mandibles tridentate. 



The male is the same except that its funicle is 4- jointed of 

 which joint 1 is shortest, subquadrate, the others somewhat 

 longer and subequal, the pedicel not so short as them. Male 

 scape compressed, dusky above at middle. 



The slender abdomen and very short propodeum are char- 

 acteristic. 



From many pairs reared from the eggs of Malacosoma amer- 

 icana and M. disstria at Berkeley, California (H. H. Severin). 



