114 THE CANADIAN ENTOMOLOGIST 



branous portion on either side of this plate being almost as large as the plate 

 itself. Segment three and beyond smooth and shining. Ovipositor subexserted. 



Male. — Like the female except for the usual sexual differences. 



Type locality.— Melrose Highlands, Mass. 



Type.— Gip. Moth Lab. No. 12007N-16. Deposited in U. S. Nat. Mas. 

 Type No. 22095 U. S. N. M. 



Host. — Phigalia titea Cram. 



Described from 21 specimens (13 females; 8 males) bred by Mr. R. T. 

 Webber, of the Bureau of Entomology, at the Gipsy Moth Laboratory, Melrose 

 Highlands, Mass., from nearly full-grown larvae of the above species, June, 

 1916, the adult parasites issuing the following spring. 



Cocoons are light brown in colour, parchment-like, and have about eight 

 strong, regular, longitudinal ridges; they are broader at the anterior end and 

 taper considerably toward the posterior end; they resemble somewhat the 

 cocoons of some species of the closely-allied genus Microplitis Foerst., especially 

 those of M. gortyncB Riley, but are much smaller. Although this species of 

 Apanteles is gregarious the cocoons are not fastened together, but are formed 

 individually on the back of the caterpillar. 



The species resembles somewhat Apanteles felticB Vier., but differs as well 

 in the paler stigma and lighter legs as in the second abdominal tergite being 

 considerably longer in proportion to its width at the apex. 



Apanteles compressus, n. sp. 



Female. — Length 2 mm. Black, shining. Head transverse; face punctate, 

 slightly broader than long; palpi yellowish white; antennae yellowish-brown on 

 scape and basal third of fiagellum, darker on apical two-thirds; apical flagellar 

 segments of antennae broad, almost as broad as long and broader than the 

 basal segments. Mesoscutum and scutellum closely punctate, the latter some- 

 what less so medially, only slightly shining; scutellum narrow, distinctly longer 

 than broad at base, very slightly convex. Mesopleura punctate and dull 

 anteriorly and below, smooth and polished above and posteriorly, where there 

 is a long, narrow, finely crenulate, longitudinal channel. Propodeum very 

 finely rugose, the posterior angles deeply sunken and shining; a very weak 

 suggestion of a median carina on the propodeum. 



Wings. — Tegulae and wing-bases black; stigma and veins brown; radius 

 and transverse cubitus forming a rather uniform arc, without the sharp angula- 

 tion at the point of union as found in many species of the genus. Legs. — Fore 

 and middle legs entirely yellowish; hind coxae black, smooth and shining, having 

 only a few distinct punctures at base above; hind trochanters and femora yellow, 

 except the upper edge of the femora dusky on the apical two-thirds; hind tibiae 

 blackish except on basal fourth, where they are yellowish; hind tarsi dusky 

 except at base of basal segment; spurs of the hind tibiae not one-half as long as 

 the metatarsus. 



Abdomen black, shining; very narrow, being greatly compressed at apex; 

 first tergite long, narrow and parallel-sided, twice as long as wide at base and 

 narrower at apex than at base, very finely rugulose, feebly striate at extreme 

 sides; second tergite triangular, only one-half as broad at base as long down the 

 middle, and three times as broad at apex as at base, almost entirely smooth and 

 polished, only the apical angles finely rugulose, this rugosity extending toward 



