OF WASHINGTON, VOLUME XVI, 1914 141 



of representatives of the more important orders of insects. 1 Re- 

 garding the Lepidoptera, he gives the following observation. 



The hind wing of a pierid, examined with a hand lens, shows all its veins 

 filled with a pale green liquid; if one sections this wing, one sees this liquid 

 issue in abundance, above all if one exercises a gentle pressure. 



It follows, then, that the Ceratopogon observed by Mr. Kryger 

 could have obtained blood from the wings of the moth in any case 

 and that it was quite unnecessary to assume that the latter was 

 immature. 



DESCRIPTIONS OF TWO PARASITIC HYMENOPTERA. 2 



BY S. A. ROHWER, Bureau of Entomology. 

 Sympherta mnemonicae n. sp. 



This species is readilj r distinguished from the other species 

 which have been referred to the genus, by the color. It differs 

 from the genus according to the characters given in the generic 

 tables by the shorter tergites. 



Female : Length 3 mm. ; length of antennae 2.5 mm. The anterior margin 

 of the clypeus truncate, ventrally convex, front finely granular and with 

 a number of widely separated, distinct punctures; area immediately below 

 the antennae slightly convex, vertex and occiput sculptured like the face; 

 intra-ocellar area slightly raised, the surface without any punctures, with 

 fi-ne granulations and parted posteriorly by a median furrow; antennae 

 28-jointed, the third joint sub-equal with the fourth; mesoscutum rather 

 coarsely granular posteriorly, anteriorly more finely granular and with 

 separate punctures; scutellum more finely sculptured than the scutum: 

 dorsal aspect of the propodeum similar to the scutellum, with a median 

 triangular areola which is petiolate; posterior face completely areolated: 

 mesepisternum except the shining fovea; and middle dorsal margin, finely 

 granular; first tergite with a short petiole broadening beyond the spiracles, 

 it and the second with coarse granulations; second tergite decidedly wider 

 than long; relative width and length of the tergites becomes greater poste- 

 riorly; third and following tergites shining, finely coriaceous; nervellus 

 broken decidedly below the middle. Black; anterior margin of the clypi 

 mandibles except the piceous apices, scape and most of the flagellar joints 

 beneath, tegulse and legs tcl<ii-<'(>n.< or nif<>-l( xtm-i <>ux : \\iny.s hyaline, irides- 

 cent, venation dark brown; cost a tetaceous. 



1 Notes sur la circulation du sang dans les ailes des insertes. Ann. Soc. 

 Ent. Belg., vol. 57, p. 184-190, 1913. 



2 Contribution from the Branch of Forest Insects. Bur. of Ent., U. S. 

 Dept. of Agric. 



