MONOGEAPH OF THE NORTH AMERICAN PROOTOTRYPID.E. 47 



are longer aud more slender, bideutate and cross each other at tips; 

 the head is qnite ditierently shaped, being ninch longer, a little wider 

 anteriorly than posteriorly; the pronotum wholly difterent; the meso- 

 notum much shorter and without furrows; the abdominal segments 

 similar, but without the warty-like tubercles on the second segment; 

 while the venation of the wing is quite difterent, the stigma being- 

 minute, the radius very long and slender, the basal cells slightly sub- 

 equal in length. 



Apenesia corouata, sp. uov. 



(PI. Ill, Fig. 3, d-) 



S. Length, 3""". Black, shining, alutaceous; mandibles long, slen- 

 der, crossing each other at tips, bidentate, rufous; antenna' 13-jointed 

 brown; pedicel longer tlmn the tirst tiagellar Joint, joints 1 and 2 of 

 flagellum equal, a little longer than thick, joint 3 a little longer, those be- 

 yond somewhat longer than the third ; head nearly twice as long as wide, 

 a little wider before than behind, the vertex with several blister-like 

 elevations. Thorax smooth, without furrows, the pronotum nearly three 

 times the length of the mesonotum, narrowed before; scutellum sepa- 

 rated from the mesonotum by a delicate transverse furrow at base; 

 meta thorax quadrate, with a longitudinal median carina. Wings 

 hyaline, the venation pale brownish, the stigma minute, the stigmal 

 nervure very long and slender; basal cells two, nearly equal. Legs 

 black, the tibise, except at tips, piceous, tips of tibia? and tarsi pale or 

 whitish. Abdomen ovate, depressed, polished black, about as long as 

 the thorax. 



Habitat. — Bladensburg, Md. 



Type in Coll. Ashmead. 



For the single specimen of this rare insect, the first male to be de- 

 scribed in the genus and the first species to be detected in the United 

 States, I am indebted to my friend Mr. E. A. Schwarz, who captured 

 it at Bladensburg, July 20, 1890. 



CEPHALONOMIA Westw. 



Loud. Mag. Nat. Hist., vi, p. 420, [1833] ; Syn. Holopedina, Forst., Verb, naturh. Ver., 

 preuss. Rbeinl..7. Jahrg.. p. .502 (18.50); Forst., Hym. Stud., ii. p. 125, 1856. 



(Type C. formiciformis Westw.) 



Head in 9 large, oblong-quadrate, flattened, in 5 more rounded; the 

 ocelli in the winged form, in both sexes, present ; in the wingless female 

 absent. 



Autennie 12-jointed, the pedicel larger than the first flagellar joint, 

 in S filiform, nearly the length of the thorax, in 9 not or scarcely longer 

 than the head, submouiliform, not incrassated toward tips. 



Maxillary palpi 4-joiuted; labial i)alpi 3-.iointed. 



]Mandibles 3-dentate. 



Thorax elongate ovate, the prothorax large and triangular, narrowed 



