476 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



separate. Mandibles reaching to the mouth opening, about three 

 times as long as broad, acute. Maxillae longer, two jointed, cy- 

 lindrical, the first joint shorter and subclavate; the second joint, or 

 palpus almost twice as long as first and tapering, longer than mandi- 

 bles. Antennae elongate, seven jointed, foliaceous with sensory 

 pits; first two joints simple, the first shortest; third about as long 

 as first with long lateral sensitive fiabellum; fourth longer than 

 second in apical half laterally produced into a fiabellum about half 

 as long as that of the third; fifth joint longer than fourth with a 

 short apical lateral projection not much longer than the width of the 

 joint, sixth joint about as long as fourth merely with a tooth-like 

 enlargement at tip; seventh joint longest of all. Pronotum merely 

 a small transverse plate set into the emargination of the head. 

 Mesonotum with two plates the first in the emargination of the 

 head and the second band-like, not covered by head. Elytra elon- 

 gate, clavate. Metanotum with praescutum rounded keystone- 

 shaped; scuti oblique slightly surpassing praescutum; scutellum 

 transverse laterally pedunculate at apex on each side; postlumbium 

 semicircular of different consistency from other parts; postscutellum 

 elongate, broad; epimeron (femoralium) reaching almost to tip of 

 postscutellum. Wings with costa very short and basal, closely 

 united with subcosta which braces the costal margin to the middle 

 of the wing: radius and medius at base are closely connected with 

 the subcosta, the radius being very weak and indistinct except as 

 detached portions in the nodal region; medius strong in its basal 

 half, distinct, and thence forked in two infuscated branches which 

 reach the outer margin; cubitus missing; first anal merely an in- 

 fuscation: second anal strong; third anal missing. Tarsi 3-jointed, 

 tlie first joint on the meso- and metn-tarsi differently shaped from 

 the following joints. Oedeagus strongly bent, basally inflated; the 

 under side being twice bent and the upper twice; the last bend being 

 a strong reflexion near the slender acute apex. 



Type of the genus. — Delphacixenos anomalocerus, new species; 

 parasitic on Delphax striatella Fabricius; Russia. 



1. DELPHACIXENOS ANOMALOCERUS, new species. 



Plate 75, figs. 1-6. 



Described from five males mounted on a single slide, which were 

 bred May 4^7 from Delphax striatella Fabricius by A. A. Ogloblin 

 at Poltava, Eussia, and presented to the writer by Prof. N. Kour- 

 dumoff. 



Male. — Length, 1.2 mm.; wing expanse, about 2.5 mm. Color, 

 brown; with postlumbium, abdomen, except two last segments and 

 venter, anterior portion of epimeron (femoralium), and anterior por- 

 tion of sternum, yellow : appendages A^ery light yellowish brown. 



