ICHNEUMON-FLIES, PART 2'. XORIDINAE 531 



Certonotus, and Apechoneura, and there is an additional genus, un- 

 described, in the Australian region. Only the genus Labena occurs 

 in our fauna. 



1. Genus Labena 



Figure 306,b 



Labena Cresson, 1864, Proc. Ent. Soc. Philadelphia, vol. 3, p. 399. Type: Cryptus 



grallator Say; designated by Viereck, 1914. 

 Caryoecus Walsh, 1866, Pract. Ent., vol. 1, p. 30. Type: (Mesochorus fuscipennis 



Brull£) = grallator (Say); monobasic. 

 Microtritus Kriechbaumer, 1889, Ent. Nachr., vol. 15, p. 307. New synonymy. 



Type: Microtritus apicalis Kriechbaumer; monobasic. 

 Dyseidopus Kriechbaumer, 1890, Ann. Naturh. Hofmus. Wien, vol. 5, p. 489. 



Type: Dyseidopus sericeus Kriechbaumer; monobasic. 

 Neonotus Parrott, 1954, Proc. Linn. Soc. New South Wales, vol. 79, p. 230. New 



synonymy. Type: Neonotus chadwickii Parrott; original designation. 



Front wing 6.5 to 19 mm. long; occipital carina complete; meso- 

 scutum without sharp transverse rugae; front tibia with a strong pro- 

 jecting thorn on apex of outer side; areolet present, large; nervellus 

 broken somewhat above the middle, or in some Australian species 

 not broken; eighth tergite of female without an apical projection on 

 each side. 



This is a large genus of the Neotropical and Australian regions. 

 There are two species in the United States. 



Key to the Nearctic species of Labena 



1. Punctures on thorax moderately coarse, those on mesopleurum separated by 

 about their diameter; temple at its midheight about 0.7 as long as eye; 

 comb on under side of last segment of front tarsus of male obliquely truncate 



at an angle about 45° from the transverse 1. grallator (Say) 



Punctures on thorax moderately fine, those on mesopleurum separated by 

 about twice their diameter; temple at its midheight about 0.9 as long as 

 eye; comb on under side of last segment of front tarsus of male obliquely 

 truncate at an angle about 30° from the transverse. 



2. tinctipennis Rohwer 



1. Labena grallator (Say) 



Front wing 7.3 to 18 mm. long; temple rather strongly convex, in 

 profile at its midheight about 0.7 as long as eye; punctures of thorax 

 moderately coarse, in most places separated by about their diameter; 

 apex of comb on under side of last segment of front tarsus of male ob- 

 liquely truncate at an angle of about 45° from the transverse. 



Coloration variable between the subspecies, but with some features 

 that occur in all of the subspecies, as follows: top of eyes joined by 

 a blackish stripe that widens to include the ocelli, the ocellar area 

 including two short oblique yellow spots; flagellum brownish fulvous, 

 yellowish postmedially (most conspicuously so in female), black 



