1913] North American Species of Megastigmus. 165 



The pupa is yellowish white and in the female has the 

 ovipositor curved over the back and reaching to about the 

 middle of the thorax. Length of female pupa, 3 mm. ; of male, 

 2.5 mm. 



While originally a native of the Western United States it 

 has been introduced into Europe and has there become a 

 serious pest. The male of this species was described by Par- 

 fitt in 1857 as the male of M. pinus. Mr. Charles O. Water- 

 house of the British Museum has kindly sent me three males 

 of this species which he compared with Parfitt's types. Safro 

 (Jour. Ec. Ent., VI, p. 283. 1913.) records rearing this species 

 from seed of Douglas Fir in Washington. 



The species listed under B in Riley's article (Proc. Ent. 

 Soc. of Wash, II, p. 360) also belong to this species. They 

 were reared from seeds of Pseitdotsuga douglassi, [taxifolia], 

 Abies magnifica, A. grandis, A. amabilis and A. concolor. 



Through the kindness of Mr, S. A. Rohwer I have been 

 able to examine specimens from the U. S. Bureau of Entomology 

 as follows: 4 9 4 cf reared from seed of Pseudotsuga taxi- 

 folia from Yreka, Calif., April and May. 3 9 2 cf reared 

 from seed of Abies magnifica from Tahoe, Calif. National 

 Forest, June, 1912; 1 9 1 cf from seeds of Abies concolor, from 

 Sierra, Calif. National Forest (J. M. Miller, Collector). 



Megastigmus aculeatus Swederus. 



Pteromalus aculeatus Swederus. Vetensk. Akad. nya Handl., XVI, p. 221. 1795. 

 Torymus collaris Boheman. Vetensk. Akad. nya Handl., LIV, p. 332. 1833. 

 Megastigmus transversus Walker. Ent. Mag. I, p. 117. 1833. 

 Torymus punctum Foerster. Beitr. Monogr. Pteromal, p. 29. 1841. 

 Megastigmus vexillum Ratzeburg. Ichn. d. Forstinsect. II, p. 182. 1848. 

 Megastigmus transversus Reirihard. Berl. Ent. Zeitschr., I, p. 76. 1857. 

 Megastigmus flavus Foerster. Verh. Nat. Ver. preuss. Rheinl. XVI, p. 109. 1859. 

 Megastigmus collaris Mayr. Verh*. zool.-bot. Ges. Wien. XXIV, p. 137. 1874. 

 Megastigmus aculeatus Thomson. Hymen. Scand. IV, p. 1. 1875. 

 Megastigmus cynorrhodi Ferris. Ann. Soc. Ent. Fr., 1876, p. 222. 

 Megastigmus aculeatus Cameron. Trans. Ent. Soc. Lond., 1879, p. 118. 

 Megastigmus collaris Wachtl. Wien. Ent. Zeit., Ill, pp. 38, 39. 1884. 

 Megastigmus aculeatus Crosby. (In part). Cornell Exp. Sta., Bull. 265, pp. 377- 

 379. 1909. 



Female. — Length, 3 mm.; abdomen, 1.5 mm.; ovipositor, 4 mm. 



General color brownish yellow. Face and cheeks yellow; vertex 

 brownish yellow; occiput with a narrow band of black above the open- 

 ing. Pronotum pale yellow behind, mesonotum black in front where 

 it shows through the thin posterior edge of the pronotum, the anterior 

 half reddish yellow ; axillse black except the inner angle ; anterior half of 

 the propodeum black or dark brown. Median carina of propodeum 

 not pronounced. Median part of the postscutellum greenish j^ellow. 



