164 Annals Entomological Society of America [Vol. VI, 



Female. — Length, 3-3.5 mm. ; abdomen, 1 .8 mm. ; ovipositor, 1 .6 mm. 



General color a yellowish brown. Face and cheeks lighter than 

 the vertex. Face with fine lines radiating from the clypeus; vertex 

 and thorax finely transversely rugulose. Head and thorax clothed 

 with stiff black hairs arising from black tubercles. Median area on 

 postscutellum, greenish yellow. Propodeum- with a distinct median 

 carina. 



Antennas brownish, scape yellow beneath, pedicel nearly black 

 above. Legs including the coxae paler than the thorax. The posterior 

 coxae clothed with stiff light-colored hairs, arising from black tubercles. 

 Wings hyaline ; stigmal club not surrounded by a cloud ; stigmal vein as 

 long as the width of club. 



Fig. 7. Megastigmus spermotrophus. 



Male.— Length, 2.9-3.3 mm.; abdomen, 1.2-1.7 mm. (Measure- 

 ments taken from alcoholic specimens.) 



Head, thorax and legs a clearer yellow than in the female. On the 

 front of the pronotum a dark brown spot is sometimes present which is 

 sometimes divided into two. Sometimes the front of the mesothorax is 

 black and shows through the posterior edge of the prothorax. Median 

 and anterior portion of the propodeum black; sides and posterior 

 margin yellow. Stigmal club darker than in female, not surrounded by 

 a clouded area. 



Abdomen brownish yellow, black at base above. 



Described from numerous specimens of both sexes reared 

 from seeds of the Douglas Fir sent me by Mr. John Crozier, of 

 Aberdeenshire, Scotland. 



The egg as obtained by dissection of the female is white, 

 smooth and spindleshaped v^ith a very long pedicel at the 

 anterior end and the vestige of one at the opposite end. Length 

 of body of egg, .36 mm.; tail like process, .9 to 1.2 mm. 



The full grown larva is yellowish white with brownish 

 mouthparts; its length varies from 2.5 to 3.5 millimeters. The 

 surface is smooth without apparent sculpture and the hairs 

 are very sparse and microscopic in size. The inner margin of 

 the mandibles is provided with three sharp teeth. 



