PROC. EXT. SOC. WASH., VOL. 21, NO. 6, JUNE, 1919 129 



apex; hind femora long with a row of very long, brownish yellow, stout 

 bristles, which are very pale yellow towards apex and the tips bent. This 

 row is located close to the under side of the femur and behind this row are 

 numerous yellow shorter bristles. Hind metatarsus long, slender and only 

 slightly bent. 

 Length 4.75 mm. 



Type Locality. Lat. 69-10 X, Long. 141 \V. 



One specimen. Aug. 14-17, 1912. J. M. Jessup, Collector. 



Type, male, Cat. No. 22322, United States National Museum. 



THE GENITALIA AND TERMINAL ABDOMINAL STRUCTURES OF 



MALES, AND THE TERMINAL ABDOMINAL STRUCTURES OF 



THE LARVAE OF "CHALASTOGASTROUS" HYMENOPTERA. 



BY G. C. CRAMPTON, PH.D., Mass. Agr. College. 



In a paper published in vol. 27, 1916, p. 303, of the Ent. 

 News, the insects here discussed were classed as a distinct order 

 called the Prohymenoptera, or sawfly group a more inclusive 

 division than MacLeay's "Bomboptera," which, according to 

 Ashmead, 1896, included only the "Uroceridae" (i. e., the Siri- 

 cidae), the "tenthredinid" sawflies being placed with the Tri- 

 choptera, by MacLeay, who restricted the designation "Hy- 

 menoptera" to the forms with apodous larvae. Rohwer and 

 Cushman, 1917, would divide the sawfly group into two sub- 

 orders, the Chalastogastra (Konow, 1897) and the Idiogastra 

 (Oryssidae), but these investigators are unwilling to admit the 

 sawfly group as a distinct order, because they consider that the 

 Idiogastra (i. e., the Oryssidae) are intermediate between the 

 rest of the sawfly group and the higher Hymenoptera called 

 Clistogastra 1 by Konow, 1897. If the existence of intermediate 

 forms, however, were sufficient grounds for "lumping" two 

 related orders into one "homogeneous" order, on exactly the same 

 grounds, we would have to group the . Lepidoptera and Trichop- 

 tera together as merely one order, since the lepidopterous family 

 Micropterygidae is unquestionably intermediate between the 

 Lepidoptera and the Trichoptera, and has even been removed 

 from the Lepidoptera and placed as a suborder of the Trichop- 

 tera by Comstock, 1918, in his recent book on the wing veins 

 of insects! The non-participation of the first abdominal seg- 



1 The division of the Hymenoptera into Symphyta and Apocrita by 

 Gerstaecker, 1867, is exactly the same as Konow'* division of the Hymenoptera 

 into Chalastogastra and Clistogastra, which it antedates by thirty years. 



