AMERICAN HYMENOPTERA. 351 



first pair. Her body measures nearly six-tenths of an inch in length." 



" Massachusetts." Not seen. 



2. 0. maurus. 



Ori/ssus maurus, Harris, Cat. and Inj. Ins. 1835, f . 



Ori/ssus Sayi, Wcstwood, Zool. Jour. 1835, 440. 



*' It is of a deep black color, rough before and smooth behind and is 

 marked with white on the antennae and legs, like 0. Jiemorrhoidalh, 

 with the addition of two short white lines on the forehead, between the 

 lower corners of the eyes. The feet are black. The wings have a 

 smoky band beyond middle which, however, fades away toward the 

 inner margin. They measure four to five-tenths of an inch in length." 



" Massachusetts." Not seen. 



3. 0. affinis. 



Ori/ssus affinis, Harris, Cat. and Inj. Ins. 1835, % . 



'' S . — DiflFers from 0. Tnmirus in having reddish feet, and in want- 

 ing the two white spots on the forehead. It measures four-tenths of 

 an inch in length." 



" Massachusetts." 



Dr. Harris thinks that this may be the male of 0. mnurua. 



2. DERECYRTA, Smith. 

 Derecyrta, Smith, Am. Mag. Nat. Hist. iv. 1860, 255. 



Wings with one marginal, elongate, appendiculate, and four sub- 

 marginals, the first small, second oblong, widest at apex, third sub- 

 quadate, fourth extending to the apex of wing, the second and third 

 each with a recurrent nervure, a little within, near their base. 



Antennse, setaceous, 23-jointed, the third joint one-half the length of 

 the scape, the fourth as long as the scape, five following joints as long 

 as the third, remainder gradually diminishing in length. 



Head subglobose, vertex convex, ocelli prominent, in a triangle be- 

 tween the eyes. 



Thorax as wide as the head, oblong, the sides parallel ; the pro- 

 thorax narrowed before into a short neck ; scutellum elevated. 



Abdomen cylindrical, about twice the length of head and thorax; 

 the ovipositor short and slightly exserted. 



Tihisc bispinose at their apex. 



1. D. pictipennis. 



Dzrecyrta pictijicnnis, Smith, Ann. Mag. Nat. Hist. iv. 1860, 255. 

 Ega, Brazil. 



