INSECUTOR INSClTlyl5 MENSTRUUS 137 
the apex and bearing on the ventral inner side a chitinized 
knob ; guard of the penis and the subtending gonapophyses re- 
markably developed, the latter appearing as widely spreading 
arms, densely pale-hairy on the outer face, the apex cylin- 
drical, naked ; the penis-guard long, needle-like, extending dor- 
sad into tlie notch of the ninth tergite ; eighth sternite with the 
broad median lobe abruptly truncated, chitinized, bearing be- 
neath two tufts of long whitish hairs ; lateral lobes short, bear- 
ing a small tuft of long whitish hairs and two or three long, 
curved, reddish bristles, one of which is more powerful than 
the others. 
The female is referred to this species with considerable 
doubt because of the very different color of the wings. The 
specimen is, in general, similar to the male, the antennae shorter, 
the flagellar segments paler brown but unicolorous as in the 
male; wings strongly yellowish including the veins; stigma 
dark brown, prominent; valves of the ovipositor extremely 
shortened, the tergal valves chitinized, short and broad, blunt, 
the sternal valves longer, broad, acutely pointed. 
Holotype, male, Plummers Island, Maryland, June 13, 1914 
(W. L. McAtee). 
Allotype, female, topotypic, June 7, 1914 (W. L. McAtee). 
The type is in the collection of the author, the allotype in 
the collection of the United States Biological Survey. 
Tipula costaloides, new species. 
Male. — Length, 11.5 mm. ; wing, 12 mm. 
Female.— Length, 12.8-13 mm.; wing, 12.5-12.8 mm. 
Palpi dark brown. Frontal prolongation of the head light 
brown, the dorsal surface with a clear blue-gray bloom, the 
nasus elongate, distinct. Antennae with the three basal seg- 
ments dull yellow, remainder of the flagellum with the seg- 
ments rather short, the basal enlargement dark brown, the re- 
mainder of each segment brown, on the terminal segments be- 
coming darker, the sclerites unicolorous. Head light gray, on 
the occiput more suffused with brown; an indistinct delicate 
brown median line. 
