22 INSECUTOR INSCITI^ MENSTRUUS 



males in this tribe of flies and this sex of the new species, at 

 present unknown, must be an immense insect. 



Ctenacroscelis rex, new species. 



Size very large (wing of the male 40 mm. or over) ; thoracic 

 stripes blackish. 



Male. — Length, 33-35 mm.; wing, 40-43.5 mm. Foreleg, 

 femora, 22 mm. ; tibia, 23 mm. ; metatarsus, 24 mm. Middle 

 leg, femora, 24-25 mm. ; tibia, 21-22 mm. ; metatarsus, 25-26.5 

 mm. Hind leg, femora, 27.5 mm. ; tibia, 30 mm. ; metatarsus, 

 31.5 mm. 



Frontal prolongation of the head moderately long, reddish- 

 brown, the palpi dark brown. Antennae short, brownish yellow, 

 the outer face of the flagellar segments with numerous black 

 hairs. Head dull yellowish brown with a narrow yellow line 

 adjoining the eye. 



Thoracic dorsum bright yellow with three grayish black 

 stripes, the median one double, the lateral stripes abbreviated; 

 scutum with a large double blackish mark on each lobe ; scutel- 

 lum and the median portion of the postnotum brown, sides of 

 the segment dull yellow. Pleura dull light yellow, unmarked. 

 Halteres slender, dark brown, the knob brighter. Legs with 

 the coxge and trochanters yellow ; femora yellow, the tips some- 

 what darker ; tibios brownish yellow, the tip indistinctly darker ; 

 tarsi brown. Wings very light brownish yellow to subhyaline, 

 the costal cell a little brighter, a faint suffusion along the 

 branches of Cu, the stigma indistinct. 



Abdominal tergites dull yellow, the apical sclerites more 

 brown. Hypopygium with the ninth tergite having the caudal 

 margin gently concave, the apical third of the segment denselv 

 hairy, especially along the outer angles ; outer lobe of the pleu- 

 rite long and slender, the base broader, gradually narrowed to- 

 ward the tip. 



Holotype, S , Taungoo District, Burma. 



Paratypes, 2 $ , topotypic. 



The type is in the collection of the American Entomological 

 Society, Philadelphia. A paratype is in the collection of the 

 author. 



