ORTALID^E — HIMEROESSA. 85 



the two posterior basal cells are rather striking for their large 

 size ; however, the anal cell, which has an obtuse posterior angle, 

 is shorter than the basal cell lying in front of it; the small cross- 

 vein is in the middle of the discal cell; the first half of this 

 cell is by no means attenuated, as is the case in the species of 

 Rivellia. 



Hab. Carolina (Zimmerman) ; Washington, D. C, Connecticut 

 (Osten-Sacken). 



Gen. II. HIMEROESSA nov. gen. 



Charact. — Front of equal breadth, distinctly projecting in profile. 

 Antennce reaching almost to the mouth, arista bare. 

 Face moderately excavated, somewhat retreating below; occiput 



moderately turgid, eyes high ; cheeks narrow. 

 Scutellum convex ; with six bristles. 



Wings: marginal and submarginal cells very narrow; second section 

 of the fourth longitudinal vein straight ; posterior crossvein pro- 

 longed beyond the fourth vein ; posterior angle of the anal cell 

 rounded. 



As I have seen only a single species of this genus, the one 

 which is described below, the definition of the generic character 

 can naturally be only a provisional one. Should the peculiar 

 prolongation of the posterior crossvein, which distinguishes H. 

 pretiosa, be wanting in some allied species, it would then be 

 necessary to omit this character from the definition of the genus; 

 the remaining characters are amply sufficient for the purpose. 



1. H. pretiosa n. sp. %. — (Tab. VIII, f. 2.) Rufo testacea, abdomine 

 violaceo, pedibus anticis totis, posteriorumque tibiis et tarsis nigris ; 

 alae hyalinae, iusequali costae limbo et fascia tenui subinterrupta nigro- 

 fuscis. 



Yellowish-red, with a violet abdomen ; the front feet altogether, the tibiae 

 and tarsi of the four posterior feet, black ; wings hyaline with an 

 irregular costal border and a narrow, somewhat interrupted crossband, 

 blackish- brown. Long. corp. 0.38, long. al. 0.3. 



Yellowish-red, shining. Front darker, opaque, of equal 

 breadth, with very indistinct traces of flat pits and a very delicate 

 border of white pollen along the orbits; distinctly projecting in 

 profile ; the little stripes, descending from the vertex along the 

 sides of the front, and the ocellar triangle are distinct, and 

 somewhat more shining; the latter is somewhat larger than 



