578 PROCEEDINGS OF TEE NATIONAL MUSEUM. vol.50. 



the occipital rim ; face as long as the length of the eyes, the antennal 

 scrobes obscure; eyes about one-fourth longer than wide, nearly bare. 

 Antennal scape reaching but little beyond plane of the front, flattened 

 and a little wider near the middle; pedicel as long as the first four 

 funicle joinst combined; funicle joints one to four subequal in length, 

 the first a little wider than long, the following increasingly transverse, 

 the fifth one-half wider again than the first and one- third longer; club 

 elongate oval, one-half wider again than last funicle joint and as long 

 as the funicle and one-third of the pedicel combined. Wings uni- 

 formly ciliated; the oblique hairless streak with an enlarged and cut- 

 off portion below, which does not quite reach the posterior border of 

 wing. Ovipositor protruded about one-fifth the length of the abdo- 

 men, the exsertcd portion hardly pubescent. Pubescence of head 

 and thorax scanty. Length, 0.7 mm., exclusive of ovipositor. 



Notum of thorax gamboge yellow, the head and underparts paler 

 yellow, and abdomen more decidedly orange; antennae and legs con- 

 colorous with head and underparts; exserted portion of ovipositor 

 almost entirely black. Wings hyaline, the veins nearly transparent. 

 Pubescence of head and thorax whitish. 



Male. — In all respects similar to the female, but the front and 

 vertex a little wider than long, and the posterior ocelli farther 

 removed from tlie eye margin. Coloration the same but thorax paler 

 and contrasting more with the deeper orange-colored abdomen. 

 Length: 0.6 mm. 



Described from ten females, two males (type, allotype, and para- 

 types a to j) reared from Erium licJitensioides (Cockerell), Salt Lake 

 City, Utah, July 14-16, 1913 (P. H. Timberlake), three of the females 

 (paratypes g to i) mounted in balsam, rest tag-mounted. 



TyiJe.— Cat. No. 19120, U.S.N.M. 



5. ACEROPHAGUS CITRINUS (Howard). 



Rhopoideus citrinus IIoward, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 235. 



Female. — Front and vortex distinctly wider than long, rather 

 coarsely alutaceous; oceUi in an obtuse-angled triangle of about 105 

 degrees, anterior ocellus at the center of the front and vertex, pos- 

 terior pair their own diameter from the eye margin and twice as far 

 from the occipital rim; face and cheeks of normal length, the former 

 as long as the length of the eyes, antennal scobes rather deeply 

 impressed; eyes rather small, one-fourth longer than wide, hardly 

 pubescent. Antennal scape reaching but shortly beyond plane of the 

 front, flattened but narrow; pedicel as long as fii'st four funicle joints 

 combined; funicle joints aU wider than long, nearly equal in length, 

 and gradually increasing in width so that the fifth is nearly twice as 

 wide as the fii'st; club large, oval, rather pointed at apex, twice as 

 wide as last funicle joint and as long as the funicle and two- thirds of 



