KO. 2219. .4 REVISION OF THJil CliMMASTINI—CUHIIMAN. 537 



One female reared by the author May 28, 1911, from rose hips in 

 company with Rhyncliytes hicolor, but which were also apparently 

 infested by a lepidopterous larva, and under Qaaintanco No. 7084. 



CREMASTUS (ZALEPTOPYGUS) DELICATUS (Cresson). 



Porizon delicatus Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 17G. 



The unique type male is in the United States National Museum, 

 as well as two other males also from the Belfrago collection. It is 

 very like reiiniae (Cresson), and the latter may be merely a darker 

 form of the present species. 



The principal characters of the species are given in the key to males. 



CREMASTUS (ZALEPTOPYGUS) RETINIAE Cresson. 



Creniastus rctiniae Cresson, Kept. Ent. U. S., for 1879, 1880, p. 238. 



This species was originally described from a single male specimen 

 reared from (Retinia) Evetna rigidana (Fcrnald) at Ithaca, New York. 

 This specimen, minus the head, is in the United States National 

 Museum. In addition there are seven other males, one each from 

 Washington, District of Columbia, and Falls Church, Virginia, and five 

 from Plummers Island, Maryland. The loss of the head of the typo 

 makes it impossible to state definitely that these are the same, but the 

 other characters leave little doubt that the determination is correct. 

 About the only difference between this and delicatus (Cresson) con- 

 sists in color, the present species having the propodeum, abdomen, 

 and sometimes the prescutum and mesosternum more or less black 

 or piceous. The specimen that has the dark color most extensively 

 developed has the occiput, vertex, front, prescutum, propodeum, 

 area around scutellum, mesosternum, mesdpleura above, metapleura, 

 metasternum, tergites 1, 2, 5, and 7 entirely and 3 and 4 partly 

 black or blackish. The pronotum is yellow, this character allying 

 it to rosae Cushman and its close relatives. 



CREMASTUS (ZALEPTOPYGUS) TETRALOPHAE, new epecles. 



Female. — Length, 9 mm., antennae 5 mm., ovipositor 3.5 mm. 

 Head from above distinctly more than twice as wide as long; temples 

 weakly rounded and strongly sloping; eyes about a third longer than 

 width of face, parallel within; malar space scarcely half as long as 

 basal width of mandible; clypeus broadly rounded at apex, about 

 two-thirds as long as interfoveal line, which is fully twice as long as 

 foveo-ocular line; ocelU about equal in diameter to ocell-ocular lino 

 which is only slightly shorter than postocellar line; occipital carina 

 briefly interrupted above. Thorax stout, the propodeum steeply, 

 arcuately sloping from near the base and extending about two-fiftlis 

 of way to apex of coxae; pronotum laterally punctate except in 

 middle; mesoscutum rather sparsely punctate, prosoutum more 



