ICHNEUMON-FLIES, PART 2'. EPHIALTLNAE 189 



2. Hairs on mesoscutum moderately dense; head black, white near antennal sock- 

 ets; pronotum mostly white 2. arizonicus, new species 



Hairs on mesoscutum very sparse; head ferruginous, the face and orbits white; 

 pronotum ferruginous 3. pictilis, new species 



1. Zaglyptus varipes (Gravenhorst) 



Figures 331,d; 368 



Front wing of male 3.0 to 4.7 mm. long, of female 4.6 to 5.6 mm. 

 long; occiput not impressed medially, so that the head does not appear 

 to be broadly notched behind; male flagellum with strong and con- 

 spicuous broad notches between the sixth and seventh and the seventh 

 and eighth segments; mesoscutum rather densely hairy, the hair 

 sockets separated by about 0.6 the length of the hairs; carina between 

 metasternum and metapleurum complete; front leg of male with two 

 broad weak notches on under side of femur toward apex and on under 

 side of tibia toward base; abdomen with rather dense coarse punctures 

 which are a little smaller and sparser on the paired swellings and absent 

 from the apical 0.2 of each tergite. 



This is a Holarctic species, with American and European subspecies. 

 The biology of the European subspecies has been described by Nielsen 

 (1935, Entomologiske Meddelelser, vol. 19, p. 206-215). It attacks 

 nest-making spiders of the genera Cheiracanthium, Alius, and Clubiona 

 that place their egg cocoons within the nests. The parasite finds a 

 nest containing eggs, stings to death the female in the nest with the 

 eggs, and lays one to eight eggs on the egg cocoon, or sometimes some 

 or all of them on the body of the spider. The ichneumonid larvae 

 consume both the eggs and most of the spider. In some cases it at- 

 tacks spiders in nests without eggs. 



The two subspecies are distinguishable on color: 



1. Hind coxa of male black; tegula of female brown; range: Europe. 



la. varipes varipes (GravenhorstJ 



Hind coxa of male fulvous; tegula of female usually white; range: Nearctic 



region lb. varipes incompletus (Cresson) 



la. Zaglyptus varipes varipes (Gravenhorst) 



Polysphincta varipes Gravenhorst, 1829, Ichneumonologia europaea, vol. 3, p. 117; 

 &. Type: d\ Warmbrunn, Germany (lost during World War II). 



Black. Clypeus dark brown; palpi stramineous; antenna brown, 

 stramineous apically and basally below; extreme hind corner of pro- 

 notum not pale; tegula stramineous to fuscous, the tegula of female 

 brown; front coxa dark brown; middle and hind coxae of male fuscous, 

 paler at apex, the middle coxa not so dark as hind coxa; middle and 

 hind coxae of female fulvous; legs otherwise as in Z. varipes incom- 



