190 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



Wings with a brownish spot beneath the stigmal vein, becoming 

 fainter as it reaches the opposite margin. 



Male.— -"Not known. 



Redescribed from one female (type), Arlington, Virginia, Septem- 

 ber, 1881 (L. O. Howard): one female (t3^pe of Aijliycv.s clvnjsopae 

 Ashmead) reared from a Chrysopa cocoon, Jacksonville, 1^'lorida 

 (W. H. Ashmead); two females. District of Columbia, one dated 

 August 26, 1890: and one female reared from material of an Aphidid 

 on elm, Yolo Countj", California (California State Insectary). The 

 latter specimen has darker legs and venter than eastern specimens. 



Tiipe.-^C&t. No. 2635, U.S.N.M. 



BRETHESIA, new genus. 



^lost closely related to Isodromus Howard, but easily recognized 

 by the small eyes, broad frontovertex, and the long face and cheeks. 

 The genus is named after Jean Brethes, in recognition of his v.'ork on 

 South American Hymenoptera. 



Female. — Head about as broad as the thorax, rather thin fronto- 

 occipitally, thickest and widest at the lower corners of the eyes, sub- 

 hemispherical in shape M^ith the face slightly inflexed and considerably 

 lengthened or somewhat subrostrif orm ; in side view the planes of the 

 frons and face meet in a xqyj oblique angle, in front view the outline 

 of the upper part of the head well rounded, but from the lower cor- 

 ners of the eyes the cheeks rapidly converge toward the rather 

 narrow oral margin; frontovertex broad or about one-half as v/ide as 

 the head yet a little longer than wide, and forming with the eyes a 

 strongly convex surface; the large ocelli in an obtuse-angled triangle, 

 the posterior pair a little less than their own diameter from the 

 eye margins and about thrice as far removed from the occipital 

 margin, the median ocellus a little behind the center of the fronto- 

 vertex; occiput rather deeply concave, the neck inserted near the 

 center, the vertical margin sharp; eyes unusually small as compared 

 with Isodromus or Ilomaloiylus, their length about one-half more 

 than their width and but little more than the width of the vertex 

 or the length of the cheeks, wider on their anterior half, their long 

 axis about parallel with the plane of the frons, and their dorsal orbits 

 parallel or hardly preceptibly diverging anteriorly; postorbital region 

 rather wide as in Isodromus or Homalotylus; face strongly convex 

 from side to side, the antennal sockets situated about one-half more 

 than their own length apart and about their own length from the 

 oral margins, their inner rims parallel: the scrobes distinct, forming 

 deep, triangular shaped grooves as wide below as the sockets, but 

 tapering and converging above although not quite meeting; both the 



