ICHNEUMON-FLIES, PART 2: EPHIALTINAE 113 



Keys to the Nearctic species of Dolichomitus 



MALES 



(Males of cephaloles, buccatus, flezilis, and foxleei are unknown.) 



1. Hind coxa black; middle coxa with three strong tubercles (basal, median, 



and apical) on its outer side; abdomen usually mostly red, but sometimes 



black. Irritator group (p. 128), in part ... 9. irritator (Fabricius) 



Hind coxa fulvous, or sometimes more or less black in D. terebrans; middle 



coxa without three tubercles on its outer side; abdomen entirely black . 2 



2. Median segments of flagellum enlarged, about twice as wide as the basal seg- 



ments; lower half of mesepimeron densely hairy. Sericeus group (p. 157). 



19. sericeus (Hartig) 



Median segments of flagellum not enlarged, of approximately the same width 



as the basal segments; lower half of mesepimeron without hairs or with a 



few hairs near its hind margin 3 



3. Pronotum with a white stripe on its upper margin, extending forward from 



its hind corner. Taeniatus group (p. 116) 4 



Pronotum without a white stripe on its upper margin, but its extreme hind 

 corner often white or fulvous 6 



4. Clypeus with a strong median apical tooth; prepectal carina absent; tubercles 



of third tergite flattened so that the tergite is rather smooth. 



3. cuspidatus, new species 



Clypeus without a median tooth; prepectal carina present below; tubercles 



of third tergite rounded and prominent 5 



5. Front coxa entirely white; punctures on third tergite separated by about 0.6 



their diameter 1. dolichosoma (Viereck) 



Front coxa white in front, the rest fulvous; punctures on third tergite sepa- 

 rated by about 1.5 their diameter 2. taeniatus, new species 



6. Clasper with a strong notch near the middle of its upper margin (figs. 344 and 



348) ; nervellus broken near or a little above its middle. Tuberculatus 



group (p. 121) 7 



Clasper without a strong notch near the middle of its upper margin (figs. 

 349, 350, 352-357); nervellus broken distinctly above its middle. Irri- 

 tator group (p. 128), in part, and Imperator gpoup (p. 152) .... 8 



7. Genitalia as in figure 348; first trochanter of hind leg fuscous above; front 



wing 5.0 to 7.2 mm. long 4. terebrans (Ratzeburg) 



Genitalia as in figure 344; first trochanter of hind leg entirely fulvous; front 

 wing 8.0 to 12.5 mm. long 5. tuberculatus (Fourcroy) 



8. Apex of clasper truncate or somewhat concave (figs. 349 and 350) ; prepectal 



carina ending near lower 0.12 of hind margin of pronotum 9 



Apex of clasper rounded or somewhat pointed (figs. 352-357); prepectal 

 carina often extending above lower 0.2 of hind margin of pronotum . 10 



9. Apex of clasper somewhat concave (fig. 349); apex of penis with a dorsal lobe 



(fig. 349) 7. populneus (Ratzeburg) 



Apex of clasper truncate (fig. 350) ; apex of penis without a dorsal lobe (fig. 

 350) 8. messor (Gravenhorst) 



10. Clasper rather broad apically (fig. 353) ... 14. californicus, new species 

 Clasper narrow apically (figs. 352, 354-357) 11 



11. Apex of clasper weakly pointed (fig. 355); hind femur blackish brown; front 



wing 5.4 to 6.4 mm. long 16. pygmaeus (Walsh) 



Apex of clasper evenly rounded; hind femur fulvous, usually infuscate at 

 apex; front wing 6.0 to 13 mm. long 12 



