96 



bulletin: museum of comparative zoology. 



middle. First discoidal cell sessile above; recurrent nervure parallel with 

 the first transverse cubitus, received near the tip of the first cubital cell; 

 marginal cell long, the radius strongly arcuate at the base, but nearly 

 straight beyond ; submedian cell considerably longer than the median ; second 

 discoidal cell completely closed ; subdiscoidal vein inserted below the middle 

 of the discoidal vein; anal cell apparently not divided. There is a constric- 

 tion beyond the first transverse cubitus as though a second transverse cubitus 

 were present, but in both otherwise finely preserved wings there is no trace of 

 such nervure. 



Described from one specimen collected by Mrs. W. P. Cockerell at 

 Station 13B. It has very well preserved wings, although the body 

 which is seen in ventral view shows few details. I cannot be posi- 

 tive that this is the proper location for the species, but I think it will 

 be sought for in this group. 



SlGALPHINAE. 



No Sigalphinae are known to occur in other formations, and only 

 one which is probably referable to Urosigalphus occurs at Florissant. 



Urosigalphus aeternus, sp. nov. (Fig. 79.) 



Probably a female. Length 2 mm. Entirely black except for the tip of 

 the abdominal carapace below, which is dark fuscous or piceous. Antennae 

 very slender, of an indeterminate number of joints as the apices are not 



preserved; basal joints elongate, 

 but those farther on (beyond the 

 middle) quadrate and distinctly 

 thicker than the basal ones. 

 Surface of head and mesonotum 

 shining, the pleurae below slightly 

 and the abdominal carapace 

 strongly rugose punctate in the 

 manner characteristic of members 

 of the subfamily. Abdomen very 

 short and stout, scarcely longer 

 than the head and thorax together, 

 both of which are also stout. Wings 

 nearly hyaline; stigma fuscous, 

 veins pale brown; Radial vein 

 originating just beyond the middle 

 of the stigma, the radial cell short, ovate ; two cubital cells, the first receiving 

 the recurrent nervure at a distance before the tip equal to the length of the 

 first section of the radius. Submedian vein not preserved. 



Fig. 79 



Type. 



Urosigalphus aeternus, sp. nov. 



