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.
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