30 bulletin: museum of comparative zoology. 



aciculation above; antennae not well preserved in the type, one of the joints 

 (probably the third) very long. Prothorax very strongly and coarsely trans- 

 versely striate, the ridges between the grooves sharp, well elevated; meso- 

 pleurae also coarsely obliquely striate; metanotum more or less distinctly 

 areolated and irregularly rugose. Abdomen inserted at the upper edge of 

 the posterior slope, about as in P. occidentalis Cress., but the abdomen appears 

 to be much shorter and stouter than in that species, although this may be due 

 to compression in the stone. The petiole appears to be short, but little longer 

 than the second segment; third to fifth somewhat shorter, subequal. Ovi- 





-w^ / 



A 



Fig. 20. — Prist aulacus roliweri, sp. nov. Type. 



positor visible for about two-thirds the length of the abdomen where its tip is 

 lost in the stone. Wings hyaline except for a very distinct infuscated spot 

 below the stigma. Veins and stigma pale brown; first recurrent nervure 

 received at three-fourths the distance from the base to the apex of the first 

 cubital cell ; first discoidal cell very small for this genus, its base scarcely over 

 one-fourth the length of the basal vein, its upper side nearly three times as 

 long as its base along the basal vein; second discoidal very high and short. 

 Second transverse cubitus present, distinct, the second recurrent nervure in- 

 serted at the apical one-fourth of the second cubital cell. Marginal cell short, 

 not more than two and one-fourth times as long as wide. 



One specimen, collected by Mr. S. A. Rohwer at Station 14; very 

 nicely preserved. 



This is a very interesting species which seems to fit tolerably well 

 in this genus. The stigmal spot which is very distinct in both wings 

 recalls at once the recent P. occidentalis Cresson which it also resembles 

 in many other characters. Hov-ever, the first cubital and the marginal 



