160 THE CANADIAN ENTOMOLOGIST 



Median carina slightly raised anteriorly; outer carinae normal. Spines moder- 

 ately long, the tips dark fuscous. Reticulations of the hood moderately large, 

 slightly larger than those of the paranota. Tumid elevations of the elytra 

 normal; costal area triseriate, the outer margin slightly concave. 



A small spot on the paranota, another on the median carina, and greater 

 part of the dorsal portion of the hood dark fuscous. Body beneath blackish, 

 sometimes slightly tinged with reddish. Nervures whitish. Elytra with a 

 band across the base, another near the apex, a spot on the paranota, part of the 

 inner portion of sutural area dark fuscous. The apical band of the elytra 

 without large hyaline cells; some cells with tiny hyaline centres. Legs and 

 antenuce yellowish white. 



Readily separated from the hazelnut tingid, Corythucha coryli Osborn and 

 Drake, by the much less elevated hood. Akin to C. bellula Gibson, from which 

 it may be distinguished by slightly longer spines, the globose portion of the 

 hood being much less narrowed dorsally and not distinctly angulate at the 

 crest, darker colour pattern, the apical band of elytra without large hyaline 

 areolae. 



DESCRIPTIONS OF FOUR NEW PARASITIC HYMENOPTERA. 



BY S. A. ROHWER, BUREAU OF ENTOMOLOGY, WASHINGTON, D.C. 



Tetrastichus rugglesi, new species. 



Female. — Length L75 mm. Subopaque dark blue, without sculpture; 

 intraocellar line subequal with the ocellocular line; antennae eight-jointed; one 

 ring joint a three-jointed funicle and two-jointed club; funicle joints subequal 

 in length and subequal in length with the pedicle; club one-fourth shorter than 

 two funicle joints, pointed apically, the apical joint longer than the preceding 

 one; mesonotum with a rather faint median furrow; scutellum with two well- 

 defined furrows; propodeum smooth, shining; prepectus sculptured like meso- 

 pleure, i.e., smooth and shining; abdomen ovate, ovipositor sheath slightly 

 exserted; costal margin of hind wing with one spine. Antennae brown; scape, 

 tibiae and tarsi and narrow apices of femora yellowish-white (tibiae somewhat 

 infuscated medianly) ; wings hyaline, venation yellowish. 



Type-locality.- — University Farm, St. Paul, Minnesota. Describsd from 

 eleven females (one type) reared as parasites of Agriliis arciiahis by A. G. Ruggles. 

 Material reared July 24, 1916, (type), July 11, 1916, and September 16, 1915. 



Type.— Cat. No. 22132. U. S. Nat. Mus. 



Trigonura hicoriae, new species. 

 Female. — Length 4 5 mm. Head with large umbilicate punctures; area 

 between eyes about one-fourth greater than length of eye; antennal foveae 

 smooth; antennae thirteen-jointed with one ring joint; ocellocular line slightly 

 shorter than the interocellar line, and not much greater than the greatest diameter 

 of a lateral ocellus; thorax with large umbilicate punctures, smaller and closer 

 on the prothorax; the depressed area of mesepisternum in which the middle leg 

 fits transversely striate; legs shining with very fine scattered punctures; hind 

 femora with eight teeth, the three apical teeth close and smaller, the posterior 

 one well removed from the others; abdomen shining, the apical segment with 

 large, irregular setigerous punctures. Black; a yellowish spot on venter; four 



June, 1919 



