18 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



Judging by host records of related species it seems more probable 

 that this species is actually parasitic upon some dipterous or hy- 

 menopterous larva infesting the egg cajjsules than that it is present 

 as a parasite of the spiders eggs. 



Family EULOPHIDAE. 



TETRASTICHUS PHILODROMI, new species. 



Resembles somewhat T . dolosus Gahan but is aeneous black in color 

 instead of bluish, the abdomen in dorsal profile is only slightly 

 longer than broad and less strongly sculptured, and the median 

 groove on mesoscutum as well as the two parallel grooves on scutellum 

 are almost effaced or very poorly developed. The postmarginal vein 

 bears from two to four erect long bristles on the upper side. 



Female. — Length, 1 mm. Head collapsed, the sculpture of face not 

 discernible, vertex, occiput and posterior orbits delicately reticulate; 

 antennae short, the flagellum not equal in length to the dorso-ventral 

 length of head; scape subcylindrical, approximately equal in length 

 to the pedicel and first two funicle joints; pedicel longer than thick, 

 and longer than the first funicle joint; ring-joints very short, the 

 number not discernible; funicle 3-jointed, the joints subequal and 

 subquadrate ; club 3-jointed, pointed ovate, thicker than f imicle, and 

 about equal to funicle in length ; mandibles distinctly tridentate, the 

 inner tooth somewhat more acute than the other two on account of 

 the deeper incision between it and the second; pronotum, mesoscutum, 

 axillae, and scutellum fuiely and delicately reticulate, the enclosed 

 areas on the praescutum and scutellum somewhat longitudinally 

 compressed; mesoscutum with the median longitudinal groove very 

 indistinct or absent and the scutellum also practically without 

 grooves although there are faint indications of them; propodeum 

 very faintly reticulated, almost polished, with a very obscure median 

 carina; forewing slightly shorter than the length of the insect, 

 evenly rounded at apex; marginal and submarginal veins approxi- 

 mately equal, the former equal to two and one-half times the stig- 

 mal; abdomen short ovate, equal in length to the thorax, about four- 

 fifths as broad as long, the dorsal segments weakly reticulately sculp- 

 tured. Color aeneous-black ; antennae brownish, the scape slightly 

 paler; coxae and basal three-fourths of all femora concolorous with 

 the thorax; remainder of legs very pale yellow, the tarsal claws 

 brownish ; wings hyaline, the venation brownish. 



Male. — Length, 1 mm. Antennal flagellum shorter than the dorso- 

 ventral height of head ; scape somewhat thickened, especially at base, 

 as long as pedicel and three first funicle joints combined, on the 

 ventral margin wdth an elongate sensory pore which extends from 

 apex almost to base and which under high magnification in balsam 

 appears as a row of subquadrate cells along the ventral margin; 



