AHT. 3 EEVISIOISr OF ICHNEUMON-FLIES CUSHMAN O 



ODONTOMERUS ATRIPES Rohwer 



Odontomerus atripes Rohwer, Proc. U. S. Nat. Mus., vol. 45, 1913, p. 358; vol. 



57, 1920, p. 456, female, male. 

 Odontomerus aethiops Johnson, Biol. Surv. of Mt. Desert Region, Part 1, The 



Insect Fauna, 1927, p. 137. 



From any other of the species with red abdomen this species is 

 very distinct in its entirely black legs. Structurally it is most 

 similar to mellipes (Say). 



Female. — Facial quadrangle about equal in length and breadth; 

 head slightly broader across temples than across eyes; temples a 

 little longer from front to back than short diameter of eye, strongly 

 sparsely punctate; face coarsely confluently punctate; ocell-ocular 

 line distinctly longer than postocellar line; antennae barely three- 

 fourths as long as body, rather stout, middle joints of flagellum 

 barely a half longer than thick, basal joint about twice as long as 

 thick and about a third longer than second; pronotum polished, 

 upper margin finely and sparsely punctate, impression foveolate; 

 mesoscutum polished with a few punctures along the notauli ; notauli 

 obscurely foveolate posteriorly, the impression formed by their 

 junction longitudinally striate; scutellum sparsely punctate; meso- 

 pleurum polished with very sparse punctures, sternum more densely 

 punctate; metapleurum and sides of propodeum opaque, the former 

 rugulose; propodeum dorsally mostly polished, rather short, the 

 petiolar area more than half as long as horizontal face, slightly 

 concave, apophyses thick and prominent; legs very stout; hind 

 tarsus much shorter than tibia, apical joint fully twice as long as 

 third; abdomen polished, first tergite transversely rugulose, apical 

 tergites very finely punctate; ovipositor sheath almost exactly as 

 long as body. 



Black with legs black or piceous, abdomen red with first segment 

 except apex black. 



Male. — Sculpture throughout more distinct; antennae as long as 

 body and slender with middle joints twice as long as thick, first 

 joint of flagellum only slightly shorter than second; hind tarsus 

 a little shorter than tibia, apical joint barely longer than second 

 and much less than twice as long as third ; abdomen entirely black. 



A much undersized female in the National Collection (5 mm. 

 long) has the legs pale reddish piceous. 



The specimens examined include four females and two males, 

 including the type and allotype, in the National Museum, two 

 females in the Canadian National Collection, one female in the 

 Cornell Collection, and two females and one male in the Collection 

 of the Boston Society of Natural History. 



