BRUES: NEW PHYTOPHAGOUS HYMENOPTERA. 267 



Dolerus JDRINB. 



This abundant North American genus has not been found at Florissant, but it 

 is known to occur in the middle Oligocene at Brunstatt in Alsace, where it was 

 noted byFb'rster ('91). Schb'berlin ('88) has also found it in the upper Miocene 

 in Oeningen. 



Macrophya pervetusta, sp. nov. 



Length 13 mm. Stout, entirely black, or at least very dark. Head nearly as 

 wide as the thorax, over three times as wide as thick antero-posteriorly, the sides 

 strongly convergent in front. Thorax elongate, twice as long as wide, the meta- 

 thorax being considerably narrower than the mesothorax. Abdomen nearly as 

 long as the head and thorax together, oval, with six segments clearly defined ; 

 rounded broadly at the tip, the extreme apex obscured. Wings hyaline, or 

 perhaps slightly infuscated. Venation typical of the genus, much like that of the 

 recent M. albicincta. Marginal cell long, its dividing nervure entering the radius 



FIG. 8. Macrophya pervetusta Brues. Fore-wing. 



much closer to the second transverse cubitus than to the first ; first recurrent 

 nervure received just before the middle of the first submarginal cell; the second 

 near the base of the third. Submedian cell but little longer than the median on 

 the externo-medial nervure. Anal cell constricted in the middle until the cross- 

 vein practically disappears; basally it is not appreciably constricted below. 



Type. No. 2045, Mus. Comp. Zool., Florissant, Col. (No. 637, 8. H. Scudder 

 Coll.). . 



The venation and the very elongate hind coxae which project backwards later- 

 ally so that their tip's extend nearly to the middle of the abdomen, determine the 

 systematic position of the species without any doubt. It resembles the present- 

 day Lagium atroviolaceum Norton so greatly in size and color that I was tempted 

 to refer it to Lagium. The antennae are not preserved, so that it seems better 

 to refer it to the larger genus Macrophya in absence of positive evidence to the 

 contrary. 



Tenthredo LINNE. 



Four species of Tenthredo, sensu stricto, have been discovered at Florissant, 

 one recently described by Cockerell, and three characterized in the present paper. 



Brischke ('86) has recognized a species in Baltic amber which he has not 

 described, and Gravenhorst ('35) also noted the occurrence of the genus in the 

 same formation. 



