1913] 



North American Species of Megastigmus. 



167 



Dean, I have been able to examine the type of this species. It is a male 

 Torymus. As the original description is rather brief I will publish 

 a more complete description elsewhere. 



Megastigmus albifrons Walker. 

 Megastigmus albifrons Walker. Trans. Ent. Soc. London, 1869. p. 314. 



Female. — Length, 5 mm.; abdomen, 2 mm.; ovipositor, 4 mm. 

 (abdomen contracted in dr^dng) . 



Head yellowish white, with many black punctures from which arise 

 black hairs; on the middle of the face the hairs are yellowish; an area 

 including the ocelli and extending almost to the eye margin, black. 



Prothorax dull yellowish, the dorsum marked with a wedge-shaped 

 black spot from the front comer of which a black line curves around 

 along the lateral margin and almost reaches the posterior edge of the 

 segment. Central lobe of the mesonotum black except along the lateral 

 edge; lateral lobes brownish blackish in the center. Scutellum black 

 except along side and at apex where it is yellowish brown. Axillae 

 black in the center, surrounded by yellowish brown. Post scutellum 

 yellowish white in the center, black on the sides. Propodeum black, 

 yellowish white at the sides. Pleuras yellowish white. 



Fig. 9. Megastigmus albifrons, 



Anntenas brownish, scape yellowish at base and below. . Legs 

 yellowish brown; tarsi blackish at tip. Front wings hyaline with a 

 distinct brownish spot adjoining the hind margin of the submarginal 

 vein beyond the junction with the basal vein. Basal vein unusually 

 distinct. Stigmal club surrounded by an indistinct clouded area 

 scarcely discernible when viewed with a hand lens. 



Abdomen shining black above, spotted with dull-yellowish on the 

 sides and below. Ovipositor black, the extreme tip yellowish. 



Male. — Length, 6 mm.; abdomen, 2.5 mm. 



Head similar to female. Thorax dull yellowish marked with a 

 black median line, enlarged in front on the prothorax, narrower on the 

 median lobe of the mesothorax and again enlarged on the scutellum. 

 The lateral black marking on the prothorax of the female is here 

 replaced with brownish. 



