156 An7ials Entomological Society of America [Vol. VI, 



FEMALES. TABLE OF SPECIES. 



1. Ovipositor not longer than abdomen 2 



Ovipositor longer than abdomen 3 



2. Stigmal club oval brevicaudis 



Stigmal club elongate physocarpi 



3. Front wings marked with a brownish spot adjoining the hind margin of the 



submarginal vein albifrons 



Front wing not so marked 4 



4. Stigma surrounded by a clouded area nigrovariegatus 



Stigma not surrounded by a clouded area 5 



5. Mesonotum black with an oblong redd^h orange area covering the posterior 



half of the middle lobe, the inner angles of the scapulse and axillse and 



all of scutellum pinus 



Not so marked 6 



6. Black species 7 



Yellow species 8 



7. Pronotum with two yellow spots tsugae 



Pronotum black without yellow spots lasiocarpae 



8. Axillce yellow; stigmal vein as long as the club is wide spermotrophus 



Axillae black except inner angle; stigmal vein shorter than the width of the 



club aculeatus 



M. flavipes Ash. (1886) was described from males only. 



Megastigmus brevicaudis Ratzeburg. 



Megasligmtis brevicaudis Ratzeburg. Ichneum. Forstinsect., Ill, p. 225. 1852. 

 Megastigmus brevicaudis Rodzianko. Comment. Torym., pp. 608-611. 1908. 

 Megastigmus brevicaudis Crosby. Cornell Exp. Sta. Bull., 265, pp. 375-377, Figs. 



77-79. 1909. 

 Megastigmus brevicaudis Rohwer. U. S. Bur. Ent., Tech. Bull. 20, pt. VI, p. 159. 



1913. 



Female. — Length, 2.4 mm.; abdomen, 1 mm.; ovipositor, .7 mm. 



Face, cheeks and a partial ring around eye yellow. Vertex and 

 occiput very dark brown, nearly black. Vertex finely transversely 

 rugulose. 



Prothorax yellowish, indistinctly marked with dusky on the sides. 

 Rest of the thorax nearly black with a dull yellowish tinge showing 

 through on the scapulas and scutellum. Antennae brownish yellow, 

 scape and pedicel black above and yellow beneath. Anterior coxas 

 yellow; middle and hind coxse brownish; rest of legs light yellowish. 

 Wings hyaline; stigmal club not surrounded by a clouded area. 



Abdomen brownish on the sides, nearly black above. Ovipositor 

 short, dark brown. 



Described from 1 9 , Ratzeburg' s type. I have three 

 females reared by W. N. Rodzianko from the seeds of Sorbus 

 aucuparia at Poltawa, Russia, which agree very closely with 

 the type. 



Fig. 1. Megastigmus brevicaudis. 



