12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.67 



Ten females and one male reared from tortricids at the Gipsy 

 Moth Parasite Laboratory, Melrose Highlands, Mass.; the type 

 under No. 6988G, host unknown; the allotype and four paratypes 

 under No. 12157C, from Westerly, R. I., host Gelechia trialhamacu- 

 lella Chambers or (Olethereutes) Peronea permutana Duponche; five 

 paratypes under No. 12101B, from Maynard, Mass., host Acrobasis 

 caryaevorella Ragonot. 



The paratypes show some variation especially in the amount of 

 white on the hind legs and of red on the abdomen, the latter being 

 sometimes entirely black. 



The cocoon of the type is mounted with the specimen. It is cylin- 

 drico-ovate, 6.5 mm. long by 2.5 mm. thick, white with irregular 

 blotches of dark brown at each end and a row of blotches on each side 

 of middle. 



Genus CREMASTUS Gravenhorst 



CREMASTUS (CREMASTUS) SINUATUS, new species 



Very distinct from all other species known to be in the peculiar 

 form of the ovipositor, which is sinuate at the apex nearly as in 

 Pristomerus. 



In my key to the North American species of Cremastus * it runs 

 nowhere satisfactorily. Specimens with the thorax strongly marked 

 with black run perhaps best to decoratus Gravenhorst but have the 

 thorax more yellow and the abdomen more red. Those in which the 

 black is largely replaced by reddish run better to couplet 7 where 

 they agree with neither alternate. 



Female. — Length, 12 mm.; antennae, 6.5 mm.; ovipositor, 5 mm. 



Head from above very strongly transverse, temples convex near 

 eyes, thence nearly flat and nearly perpendicular to body axis; head 

 from in front distinctly broader than long; face as broad as length of 

 eye and slightly broader than frons, medially slightly convex and 

 densely punctate, laterally shagreened and sparsely punctate; clypeus 

 two-thirds as long as interfoveal line, strongly convex, apically 

 rounded, sparsely and coarsely punctate; malar space three-fourths 

 basal width of mandible; diameter of lateral ocellus slightly longer 

 than ocell-ocular line, three-fourths postocellar line. Thorax mod- 

 erately long, with coarse, well separated punctures, the pronotal 

 furrow and the speculum polished, scutellum sparsely punctate, 

 rather flattened, with lateral carinae strong at base but terminating 

 abruptly just beyond; propodeum extending slighlty beyond middle 

 of coxae, in profile strongly arched, opaque shagreened, coarsely and 

 sparsely punctured and medially, especially in petiolar area, trans- 

 versely rugose, areola only a little longer than broad, two-thirds as 

 long as petiolar area, from which it is distinctly separated; stigma 



* Proc. U. S. Nat. Mus., vol. 53, 1917, pp. 511-516. 



