BRUES: PARASITIC HYMENOPTERA. 97 



One specimen and reverse, collected by Mr. S. A. Rohwerat Station 

 13. Type in the Amer. Mus. Nat. Hist. 



This is quite a characteristic member of the Sigalphinae, but may 

 not be a true Urosigalphus, since the length of the submedian cell 

 cannot be determined. 



Cheloninae. 



Both Gravenhorst ('35) and Brischke ('86) have found Chelonus in 

 Baltic Amber, and the material which I have from Florissant contains 

 three species of this same genus. 



Chelonus Jurine. 



Key to the Florissant species of Chelonus. 



1. Abdomen strongly longitudinally aciculated, wings infuscated. 



C. muratus, sp. nov. 



Abdomen coriaceous, or irregularly rugose, wings hyaline or 



nearly so 2. 



2. Pleurae very coarsely rugose C. solidus, sp. nov. 



Pleurae only slightly rugulose, smooth below. C. depressus, sp. nov. 



Chelonus muratus, sp. nov. (Fig. 80.) 



Length 3.5 mm. Small, black or dark colored, the abdomen lighter below. 

 Antennae rather long, of the usual form, about 30-jointed, the joints becoming 



Fig. 80. — Chelonus muratus, sp. nov. Type. 



very short toward the apex. Flagellum brown, scape black. Head finely 

 lineately rugose or aciculate. Thorax finely rugulose or coriaceous, the pleurae 



