]68 INSECUTOR INSClTlit MENSTRUUS 



nate ; inner verticals very long and stout, erect, somewhat convergent ; 

 outer verticals stout, divergent ; vibrissae long and distinct. Eyes hairy. 

 Antennae short and stout ; arista rather coarse, with five or six short dor- 

 sal rays, none ventraUy. Notopleural bristles at equal height ; prescutellar 

 bristles absent ; two peurs of very large dorsocentrzJs ; mesosternum with 

 two bristles, the one behind the middle long and stout, the other small 

 and situated near upper margin. Wings broad £md rounded ; costal vein 

 reaching to end of fourth vein ; subcostal vein distinct basally, indistinct 

 distally and convergent with the first vein ; third and fourth veins subpar- 

 allel, very slightly converging toward wing-tip ; posterior cross-vein remote 

 from wing-margin, shorter than last section of fifth vem ; anal cell closed, 

 the anal vein present. Legs with preapical bristle on front and hind 

 tibiae ; middle tibiae with apical and preapical bristle. 

 Type of genus, Titanochata ichneumon, new species. 



Titanochaeta ichneumon, new species. 



Thorax and head light gray pruinose; frons above antennae, face, 

 basal portion of abdomen, coxae, and legs pale yellow ; bristles and hairs 

 black. 



Male : Frons over one-third the width of head, converging somewhat 

 toward antennae; ocellar triangle and orbits rather weakly differentiated, 

 the former moderately large, not reaching halfway to antennae, detached 

 nearly to posterior margin ; anteriorly the entire frons is pale yellow, pos- 

 teriorly the frontal stripe becomes more grayish, while the orbits and 

 ocellar triangle are gray pruinose ; some scattered fine hairs on anterior 

 third of frontal stripe. Eyes bright brown, with irregularly scattered, 

 minute black dots and with stiff white hairs. Face yellowish, white- 

 pruinose at margins, flattened, very weakly carinate, epistome shallowly 

 emarginate ; vibrissae very large and stout, followed by a few bristles on 

 the cheeks and a differentiated buccal bristle; cheeks rather narrow. 

 Proboscis very short, fleshy. Antennae short and stout, reaching slightly 

 over halfway to oral margin, pale yellow, the third joint darker and dor- 

 sally infuscated ; second joint with black hairs and a long black bristle ; 

 third joint thick, bluntly conical, with black arista bearing five well sepa- 

 rated dorsal rays. Thoraoc convex, not as wide as the head and nar- 

 rowed posteriorly, entirely pale gray pruinose ; mesonotum with rather 

 coarse and sparse, evenly distributed black hairs not forming regular series. 

 Scutellum large, rather elongate, with rounded margin ; two pairs of large 



