A SYNOPSIS, AND DESCRIPTIONS OF THE NEARCTIC SPE 

 CIES OF SAWFLIES OF THE GENUS XYELA, WITH DE- 

 SCRIPTIONS OF OTHER NEW SPECIES OF SAWFLIES. 



By S. A. RoHWER, 



Of the Bureau of Entomology of the United States Department of Agriculture. 



The following paper, which is a contribution from the Branch of 

 Forest Insects, Bureau of Entomology, United States Department of 

 Agriculture, contains a synopsis of the Nearctic species of the genus 

 Xyela and descriptions of certain other sawflies. The types of all 

 the new species are m the collections of the United States National 

 Museum. 



Family XYELID^ 



Genus XYELA Dalman 



Table to the Nearctic species of Xyela. 



Females 1 



Males 13 



1. Antennal furrows incomplete but represented by elongate foveae basally. ... 2 

 Antennal furrows complete to the ocelli 6 



2. Clypeus not carinate to the apex and without a small median tooth. safe's, p. 266 

 Clypeus carinate to the apex, with a small median tooth 3 



3. Between the bases of the antennae is a carina hakeri, p. 267 



No carina between the bases of the antennae 4 



4. Clypeus with a large, sharp, triangularly shaped tooth; body pale pini, p. 267 



Clypeus with only a low, rounded tooth; body black 5 



5. Area between the antennae flat alni, p. 268 



Area between the antennae depressed winnemanse, p. 268 



6. Clypeus with a large, sharp, triangularly shaped tooth 7 



Clypeus without a large, sharp, triangularly shaped tooth 9 



7. A small tubercule between and above the bases of the antennae minor, p. 269 



No such tubercule between the bases of the antennae 8 



8. Scutellum with a strong median furrow; head and mesonotum shining, very 



finely granular; ovipositor but little longer than the abdomen; mesepister- 



num pale pini, p. 267 



Scutellum without a median furrow; head and mesonotum opaque, coarsely 

 granular; ovipositor much longer than the abdomen; mesepisternum 

 black luteopicta, p. 269 



Proceedings U. S. National Museum, Vol. 45— No. 1 981 . 



265 



