1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 633 

 Rhogas geometrae n. sp. 



Male.— Length, 5f mm . Very close to Eh. rileyt, Cr., only slightly 

 smaller and more slender and the sculpture finer, as in Rh. intermedins 

 Cr. Antennae 50-jointed, black, the joiuts of the flagellum being slightly 

 longer than wide ; eyes black, subreuiform ; parapsidal grooves entirely 

 wanting ; metathorax with delicate median and lateral keels, the former 

 forked at apex; a distinct longitudinal medial keel on 1st aud 2d ab- 

 dominal segments, becoming almost obsolete on the 3d, only traceable 

 at base. The wings are hyaline, strongly iridescent ; the 2d submar- 

 ginal cell is not quite twice as long as the 1st branch of the radia) ; 

 the 1st transverse cubital vein is slightly oblique and about as long as 

 the 1st branch of the radius. 



Habita t. — Missouri. 



Described from three male specimens, reared from an unknown geo- 

 metrid larva, May 5, 1877. (Coll. C. V. Riley.) 



This species is separated from Eh. rileyi Cr. and Eh. intermedins Cr. 

 by the absence of parapsidal grooves, different venation, and the number 

 of antenna! joints. 



Rhogas platypterygis n. sp. 



Male and female. — Length, 5 mm . This species very closely resembles 

 Eh. geometra, agreeing in stature and sculpture ; it is, however, paler or 

 yellowish brown, and has distinct parapsidal grooves. The female an- 

 tennae are but 35-jointed, pale brown, the flagellar joints hardly twice 

 as long as wide ; in male 31-jointed, the flagellar joints being thrice as 

 long as wide; wings hyaline, strongly iridescent; veins brown except- 

 ing the costre, median and submedian veins basally ; the stigma at base 

 and post-marginal vein are yellow ; the 2d submarginal cell is more 

 than twice as long as the 1st branch of the radius ; the 1st transverse 

 cubital nervure is straight, nearly twice as long as the 1st branch of 

 the radius, parallel with the 2d transverse cubital uervure, but half as 

 long again as that vein ; the 2d submarginal cell is, therefore, long and 

 narrowed apically. 



Described from five specimens, one male and four females, labeled 

 Eo. 2907°, reared October 23, 1883 from a lepidopteron, Platypteryx sp., 

 found on alder. 



Rhogas siniillimus n. sp. 



Male.— Length, 5f mm . This species is almost exactly like Eh. platypte- 

 rygis. only it is slightly darker in color. The ocelli are placed on a black 

 spot and the antennae are 14-jointed, black, excepting the two basal 

 joints, the flagellar joints being almost twice as long as wide; the 1st 

 transverse cubital nervure is about as long as the 1st branch of the 

 radius, slightly obliquely directed; while the 2d transverse cubital 

 nervure is only slightly shorter than the 1st; the stigma and veins are 

 brown. 



Habitat. — N ew Hampshire. 



