1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 631 



but areolated, tbe median keel quite distinct ; abdomen ovate; the 1st 

 segment is roughened, the plate distinct, narrowed at tip, the sides 

 parallel ; the other segments are smooth and more or less obfuscated. 

 Wings hyaline, the stigma and veins pale; the 1st branch of the ra- 

 dius issues from beyond the middle of the stigma, the 2d branch being 

 but slightly longer than the 1st, while the 1st transverse cubital ner- 

 vine is very oblique and interstitial with the recurrent nervine ; the 2d 

 submarginal cell is, therefore, very much longer along its lower than 

 along its upper margin. 



Habitat. — Washington, D. C. 



Described from four specimens, three having lost their heads and one 

 its antennas, reared August 21, 1884, from a small larva found on oak. 



Subfamily RHOGADIN^E. 



PETALODES Wesmael. 



(?) Petalodes politus n. sp. 



Male. — Length, ll mm . Black, polished ; palpi, anterior and middle legs, 

 and posterior coxas, trochanters and tarsi, honey-yellow; posterior fe- 

 mora and tibia 3 rufous. Antennas long, involute at tips, 43-jointed, the 

 two basal joints and the two following more or less yellow, the rest black; 

 the joints of the flagellum are a little more than four times longer than 

 wide. The head is shaped as in the genus Rhogas; vertex smooth, a 

 deep excavation in front of the ocelli ; the inner orbits and face punctate, 

 the latter rugose-punctate and pubescent; mandibles rufous at base; 

 maxillary palpi unusually long, when extended reaching beyond the 

 anterior coxre, 5-jointed, the 1st annular, the 2d half the length of the 

 3d, dilated, especially to one side at base, the following joints long 

 and cylindrical, the terminal joint being slightly longer than the 4th ; 

 labial palpi short, 3-jointed, not as long as the 2d and 3d joints of the 

 maxillary palpi united, the basal joint is swollen, the other two cylin- 

 drical, the 3d being very short. Parapsidal grooves distinct, deep, 

 converging and meeting posteriorly, the middle lobe being prominent; 

 the collar is rugose; disks of mesopleura smooth, the margins rugose; 

 metathorax rugose, areolated, the spiracles oval. The abdomen is long, 

 linear, subcompressed, one and a third times longer than the head and 

 thorax together, black, polished, the ventral surface of the 1st and 

 2d segments and the incisions of 3d and 4th only honey-yellow; the 1st 

 segment above or dorsal Iy. is depressed about the middle, deeply so 

 laterally, and this portion is keeled to near base of segment, the apex 

 convex; the tip of the abdomen is pubescent. Wings hyaline; the 

 stigma aud veins, more or less black, the costse, median and submedian 

 veins being yellowish toward their base; the submedian cell is not 

 longer than the median aud the 2d submarginal cell is trapezoidal ; other- 

 wise the venation is as in Rhogas. 



Habitat. — Lansing, Michigan. 





