ICHNEUMONID FINAL INSTAR LARVAE — SHORT 405 



lobes on the veutral surface of the labial sclerite, which is 

 slightly pointed. The more posterior part of the hypostoma is 

 slightly enlarged in C. variatipes but not in C. nuMlipennis. The 

 body setae are conspicuously large in C. nubilipennis. C. dim.orphus 

 Cushman is figured by Sauer (1939) and lobes do not appear to be 

 present on the ventral surface of the labium, although the figure is 

 too small to show the head structures clearly. 



Genus Ephialtes. — E. irritaior (Fabricius) has been examined (fig. 

 3a). E. elegans (Woldstedt) is figured by Beirne (1942a), E. mani- 

 iestor (Linnaeus) by Baumann (1933), E. punctulatus Ratzeburg b}^ 

 Beirne (1941) and Rosenberg (1934), and E. rvficollis (Gravenhorst) 

 by Thorpe (1930). All these species have numerous lobes on the 

 ventral surface of the labial sclerite. 



Genus Iseropus. — The species of this genus are gregarious. /. 

 califortiicus Cushman and /. stercorator brurmeifrons (Viereck) (fig. 

 3b) have been examined. The enlargement of the hypostoma is m.ore 

 marked in /. californicus than in /. stercorator brunneifrons. I. 

 stercorator stercorator (Fabricius) is figured by Beirne (1941). 



Genus Tromatobia. — Species of this genus parasitize the egg 

 cocoons of spiders. T. rufopectus (Cresson) (fig. 3c) and T. zonata 

 (Davis) have been examined. The head sclerites are slender with 

 no lobes on the ventral surface of the labium and no enlargement of 

 the hypostoma. A slight epistoma is visible and teeth appear to be 

 present only on the dorsal surface of the mandible. Maneval (1936) 

 notes the presence of groups of large hooked spines on the dorsal 

 surface of the first seven abdominal segments of Zaglyptus varipes 

 varipes (Gravenhorst). Similar spines are present on the abdomen 

 of Tromatobia (fig. 3C3). These spines, which appear to be holdfast 

 organs, closely resemble the body spines of the Polysphinctini. Like 

 Trombatobia and Zaglyptus, the Polysphinctini are parasites of spiders. 



Genus Delomerista. — The species of this genus are parasites of the 

 cocoons of sawflies. D. diprionis Cushman has been examined 

 (fig. 4a). The bifurcate mandibles may be distinctive of this genus. 

 Morris, Cameron, and Jepson (1937) figure Delomerista sp., where the 

 mandible appears to have the same shape as that of other Ephialtini 

 and a more or less complete epistoma is present. It is unfortunate 

 that the identification was not taken further. 



Tribe Polyspbinctini 



Figure 5 



The members of this tribe are parasites of spiders. 



The setae on the head and body are conspicuously long, the setae 

 on the bod}^ being at least as long as the blade of the mandible; the 

 dorsal part of the epistoma is not sclerotized and the pleurostoma is 



