382 N. C. AGR. EXP. STA. BUL. 239 
Crown, pronotum, and scutellum with black markings much as in S. regalis, 
n. sp. (p. 376), but posterior paired markings of crown connected in some 
specimens, with the posterior pronotal markings extending forward farther 
onto pronotal disk, and with black basal angles of scutellum connected by 
black transcutellar sulcus; forewing with an arcuate black spot on each 
humeral margin, not connected with large transcommissural lenticular claval 
black marking, claval suture bordered broadly at base, more narrowly apically 
with black, with a longitudinal black stripe in corium extending from basal 
third almost to base of outer apical cell; membrane and costal margin black, 
latter bordered with hyaline almost to apex of outer apical cell. 
Holotype male, one additional male and two females, Rockstone, British 
Guiana, February 1-12 (OSU). One female, Mazaruni Head, Pakaraima 
Mountains, British Guiana, 1932 (J. G. Myers) (BM). One female, Rio 
Uaupes, Taracua, Amazonas, Brazil (RMS). 
Externally, S. dextrorsus, n. sp., is close to S. azatus, n. sp., but may be 
separated from the latter by its paired black markings on the posterior margin 
of the crown. The male genitalia of dextrorsus are most closely related to S. 
falcifer, n. sp. (p. 376) from which it may be distinguished by its asym- 
metrical aedeagus, its shorter apical aedeagal process, its lack of a convexity 
at the base of each ramus of the paraphyses, and the presence of the scalelike 
setae on the posterior margin of its pygofer. 
Soosiulus febris, NEW SPECIES 
FicgurE 306, PAGE 383 
Length of male 7.9-8.0 mm. Head with median length of crown slightly less 
than six-tenths interocular width and slightly more than one-third trans- 
ocular width, ocelli located slightly before a line between anterior eye angles, 
each slightly closer to median line than to adjacent anterior eye angle, cly- 
peus with muscle impressions distinct. Thorax with pronotal width ap- 
proximately equal to transocular width of head; forewing with membrane in- 
cluding inner apical cell and apical portions of remaining apical cells. Male 
pygofer with a number of minute microsetae near basiventral margin, in 
lateral view abruptly narrowed near midlength of posteroventral margin; 
plates not extending posteriorly nearly as far as pygofer apex, with a few uni- 
seriate macrosetae; style extending posteriorly to a point opposite three- 
fourths length of connective; connective sagittate in form, not keeled; aedeagus 
symmetrical, shaft in lateral view broad in basal half, with a broad ventro- 
apical slightly recurved tooth, ventral margin irregularly dentate; paraphyses 
stalked, in lateral view with rami slender, tapering, acute apically; curved 
regularly posteriorly and ventrally. Female unknown. 
Crown with a pair of marginal rounded black spots behind apex and a me- 
dian basal black spot which includes ocelli; pronotum with anterior margin 
broadly bordered with black between eyes, posterior margin with a short 
narrow black mark near lateral margin on each side and a pair of broader 
black longitudinal markings extending anteriorly more than half the length of 
