76 THE CANADIAN ENTOMOLOGIST. 



squamosely reticulated. Sciitellum with four conspicuous longitudinal 

 furrows, two on each side of the meson, the lateral ones barely visible from 

 the direct dorsal aspect and at the lateral margin of the sclerite in the 

 dorso-lateral aspect. Parapsidal farrows conspicuous, deep ; mesoscutum 

 with a slight carina along the median line. Abdomen ovate, the segments 

 subequal, segment 2 longest, 3 shorter than 4, 5 and 6, widest at segment 

 4, and about equal in length to the liead and thorax combined ; caudal 

 margins of the segments straight, or slightly concaved at the meson. 

 Tarsi 4-jointed. 



Fore wings hyaline, the marginal fringes short, the discal cilia 

 uniform ; postmarginal vein absent, the marginal vein about a fourth 

 longer than the submarginal, the latter broken. Hind wings uniformly 

 ciliate discally. Stigmal vein of fore wings moderate in length, clavate, 

 and with an uncus. 



Antennae 9-jointed ; scape about equal in length to the pedicel and 

 first funicle joint combined, inserted not much below the middle of the 

 face ; pedicel subconic, over one-third shorter than funicle joint i ; ring- 

 joint inconspicuous but evident ; funicle joints i and 3 subequal, cylindrical 

 oval, funicle 2 slightly longer, nearly twice the length of the pedicel ; the 

 three club joints decreasing in size, the basal joint longer than the pedicel, 

 nearly a third shorter than funicle 3 and a fourth longer than joint 2 of 

 the club ; the apical joint conical, smaller than -the pedicel, and ending in 

 a short spine-like projection. Antennae bearing stiff curved bristles, the 

 flagellum longitudinally carinate. Ovipositor not exserted. Mandibles 

 fuscous, tridentate, symmetrical, the outer and next tooth conspicuous, 

 the inner or third tooth one-half shorter than the second, barely defined, 

 its inner (nasal) margin obliquely concaved. 



From T^;^ specimens, ^^-inch objective, i-inch optic, Bauschand Lomb. 



Male. — Length 1.5 mm., smaller, more slender. The same. Ab- 

 domen cylindrical ; antennae slightly lighter in colour, more hair}^ the 

 setce longer, lo-jointed, the same, but the funicle 4-jointed, the first joint 

 distinctly smaller than the others, the ring-joint minute, subobsolete, and 

 the two basal joints of the club subequal in length ; funicle joints 2 and 3 

 equal, longer than 4. Mandibles the same. 



From 4 specimens, the same magnification. 



Described from four males, thirty-five females, reared in the insectary 

 of the State Entomologist, Urbana, Illinois, May 27, 1908, from, sup- 

 posedly, a single larva of Malacosoma americana (Harris) on apple twigs. 

 On May 18 this supposed lasiocamjiid larva was dissected and found to 



