32 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
County, North Carolina, collected by Nell B. Causey on April 30, 1939. 
Diaenosts: A large broad species of the genus, in which the gonopod 
is characterized by the pronounced subterminal expanded area. The 
very slightly elevated podosterna also appear to signalize this form. 
DESCRIPTION OF TopoTYPE: Adult male 33 mm. in length; width 
of segment 6, 9.0 mm.; segment 9, 9.0 mm.; segment 12, 8.5 mm.; 
segment 16, 7.6 mm. 
Color in life dark glossy brownish black, with upper surface of 
paranota, caudal edges of metatergites, epiproct, and circumference 
of collum bright orange red, underparts dirty white, legs grading to 
pink distally; head and antennae brown. 
Head somewhat flattened between the antennal sockets, vertigial 
groove distinct but not punctate. Median genal depressions distinct, 
continuous with the flat surface of the clypeus. Labral setae about 
12-12, clypeal setae about 9-9, not extending onto lower genal margins. 
Interantennal isthmus proportionately narrow (1.2 mm.), only 17 per- 
cent of the antennal length (7.0 mm.). 
Antennae extending back to middle of fourth tergite, article 2 the 
longest, articles 3-6 subequal in length, article 1 much longer than 7. 
Collum distinctly broader than the following tergite, extending 
ventrolaterad about 0.5 mm. below it on each side; anterolateral 
marginal groove distinct. 
Form of tergites similar to that described for D. brimlewi. Caudo- 
lateral corners of paranota produced into a small acute lobe which 
projects beyond caudal edge of each paranotum. Paranota of seg- 
ment 18 elongate-triangular, those of segment 19 distally rounded 
lobes. 
Hypoproct semicircular, but with a small and distinct median angle. 
Caudal edges of segments set off by a fine but distinct marginal 
ridge running from under side of paranota down to coxal sockets, 
this ridge set off by a slight, shallow depression suggesting that found 
more conspicuously in brimlewt. Remainder of sides of segments 
smooth except on segments anterior to eighth, which are produced into 
low conical knobs over the coxae. 
Podosterna low and vaguely defined, sloping upward very gradually 
from level of the interzonal furrow, and with one and often two dis- 
tinct broad median depressions. Podosterna with transverse rows of 
scattered setae as far back as segment 15. 
Gonopod aperture large and transversely ovoid, its lateral ends 
rounded, the caudolateral edges flanged, with a low flange in front 
of the depressed intercoxal surface of the segment. 
Gonopods with noticeably large coxae. Telopodite distinctly less 
curved than in the other species, the distalmost fourth abruptly 
recurved proximad and strongly expanded, the lamellate area extended 
