168 PROC. ENT. soc. WASH., VOL. 21, NO. 7, OCT., 1919 



wings faintly infuscated on basal half, hyaline apically, venation blackish. 

 Otherwise agrees with the description of richmondi. 



Male. -Like female except that the black on frons is confined to a large 

 rounded spot embracing the anterior ocellus and confluent above with the 

 black on vertex; the propodeum is largely concolorous with mesoscutum 

 and lacks a definite transverse carina, while the spiracles of first tergite are 

 more prominent than in the female. 



Type locality. Cherryfield, Maine. 



Type. Cat. No. 2237S, U. S. Nat. Mus. 



Two females and one male received from E. Avery Richmond, 

 who states that they were swept by Mr. W. Colcord Woods, 

 August 26, 1915, on the blueberry "barrens" at Cherryfield, 

 Maine. 



The types of this species were apparently collected at the same 

 time and under the same conditions as those of Optus richmondi. 

 The remarks appended to the description of the latter species 

 would therefore apply equally to this one and the species may be 

 parasitic on Rhagoletis pomonella Walsh. 



Opius trinidadensis, new species. 



This species is at once distinguished by its large size and lack 

 of sculpture from the blackish species included by Brues and 

 Richardson in their key to known species of Opius inhabiting 

 South and Central America (Bull. Amer. Mus. Nat. Hist., vol. 

 32, 1913, p. 502). In the writer's key (1. c.) it runs to crawfordi 

 Viereck, and is very closely related to that species but may be 

 distinguished by slight differences in the clypeus as well as by 

 the color of the mesoscutum. 



Female. Length 5.5 mm.; length of ovipositor 6 mm. Head viewed 

 from above fully twice as broad as long; ocellocular line approximately two 

 and one-half times the diameter of an ocellus; ocellar triangle distinctly 

 elevated and bounded laterally by shallow grooves; posterior orbits equal to 

 about half the eye-width; frons and vertex polished with very few hairs; 

 vertex nearly straight, not arched above the top of eyes; face rather thickly 

 hairy, shining, with distinct setigerous punctures, and a strong median, 

 longitudinal ridge extending from the antennal fossae to the middle of clypeus ; 

 anterior margin of clypeus very slightly angulated at the middle and at 

 each lateral angle; these angulations similar to those in crawfordi but less 

 prominent; malar space slightly longer than width of mandible at base; 

 cavity between the clypeus and mandibles transverse, about half as broad 

 as the median length of clypeus; antennae inserted far above the middle 

 of eyes, longer than body, 54-jointed, the flagellar joints all longer than 

 broad; thorax polished; mesoscutum with distinct, complete, non-foveolate, 



