﻿NEARCTIC SPECIES OF GASTERUPTIIDAE — TOWNES 121 



Genus GASTERUPTION Latreille 



Gasteruption Latreille, Pr6cis des caract^res g^n^riques des insectes dispos6s 



dans uii ordre naturel, p. 113, 1796. Type: Ichneumon assedator Linnaeus; 



designated by Kioffer, 1903. 

 Foenus Fabricius, Entomologia systematica . . . , Suppl., pp. 210, 240, 1798. 



Type: Ichneumon assedator Linnaeus; designated by Curtis, 1832. 

 Gastryptium Agassiz, Nomenclator zoologicus, Index p. 160, 1846. Emendation 



of Gasteruption Latreille. 

 Gasteryption Semenow, Bull. Acad. Sci. St.-P6tersbourg, new ser., vol. 3, p. 12, 



1892. Emendation of Gasteruption Latreille. 

 Gasteruptium Schulz, Spolia hymenopterologica, p. 133, 1906. Emendation of 



Gasteruption Latreille. 



In addition to the differences pointed out in the key, this genus 

 differs from Rhydinofoenus in having the antenna, thorax, abdomen, 

 and legs somewhat shorter and in rarely having the hind tarsus marked 

 with white. The short ovipositor, shallowly notched female sub- 

 genital plate, and blunt pronotal tooth are the recognition characters. 



The genus is mostly Holarctic in distribution. I have seen also a 

 species from the Philippines. 



KEY TO THE NEARCTIC SPECIES OF GASTERUPTION 



1. Mesoscutum coarsely punctate or coarsely rugosopunctate; ovipositor sheath 



white at the apex; eye apparently bare (but with minute hairs). 



3. amputatum, new species 



Mesoscutum with moderately fine to very fine sculpture; ovipositor sheath 



uniformly dark ; eye evidently hairy 2 



2. Frons and lateral lobe of mesoscutum weakly shining and with dense, fine, 



sharp punctures; second segment of hind tarsus about 2.2 as long as wide in 

 male and about 1.6 as long as wide in female; fourth antcnnal segment 



about 2.0 as long as wide 3 



Frons and lateral lobe of mesoscutum mat and with scattered fine indistinct 

 punctures; second segment of hind tarsus about 3.7 as long as wide in male 

 and about 3.0 as long as wide in female; fourth antennal segment about 2.6 

 as long as wide 4 



3. Less than 0.6 of third and fourth tergites ferruginous, la. kirbii kirbii Westwood 

 More than 0.6 of third and fourth tergites ferruginous. 



lb. kirbii russeus, new subspecies 



4. Mesoscutum with a fine but rough appearing sculpture, and often with some 



medium-sized punctures; east of Rocky Mountains in Transition and Upper 



Austral zones 2c. assectator area Couper 



Mesoscutum with a very fine smooth sculpture, including some small indistinct 

 punctures 5 



5. Thorax entirely or partly ferruginous, at least along sutures; Utah. 



2b. assectator utahensis, new subspecies 



Thorax entirely blackish; Pacific to Rocky Mountains, and in Canadian Zone 



east to Atlantic 2a. assectator assectator Llrmaeus 



1. gasteruption KIRBn (Westwood) 



Second segment of hind tarsus of male about 2.2 as long as deep, of 

 female about 1 .6 as long as deep. 



