36 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



base, a large ovate spot on each side of pronotiim behind eye, a mark 

 on dorsal callus behind e3^es, and a spot on anterior face of pronotum 

 laterad of disc piceous, the last mark more or less concealed by hind 

 margin of head; a spot on mesothorax below base of tegmina and a 

 small spot near base of mesocoxae fuscous; a narrow line on outerside 

 of pronotal spot white. Tegmina subhyaline with a sordid yellow 

 tinge; cells at apical margin in M and Cui infuscate. Wings hyaline, 

 faintly tinged brown, with brown veins. 



Anal segment of male elongate-rhombic, anal foramen situated 

 slightly basad of middle, lateral margins tapering from this level to 

 deeply rounded apex; in profile porrect caudad, with lower lateral 

 margin straight or nearly so. Pygofer with laterodorsal angles 

 obtusely rounded, not at all prominent, lateral margins shallowly 

 convex, devoid of processes. Aedeagus tubular, curved upward dis- 

 tally, lateral dorsal margins diverging basad; in profile Avith a broad 

 and rather long flattened process on each side, closely adpressed to 

 aedeagus, directed ventrocephalad and abruptly narrowed distally 

 into a sinuate spine; these processes in ventral view gradually con- 

 verging cephalad, but abruptly bent laterocephalad near apex. 

 Genital styles subtriangular, expanding distally, ventral margin 

 feebly convex, dorsal margin straight, ascending to dorsal process, 

 apical margin straight, oblique; dorsal process subtriangular in side 

 view, with a short horizontal lamina arising on outer surface near 

 base, apically bent dorsocephalad in a curved spine. 



Female genitalia as in T. musca. Pregenital sternite broadly ex- 

 cavate on hind margin, but medially slightly produced dorsocaudad 

 in a short convex lobe. 



Male, length 5.8 mm., tegmen 4.5 mm. Female, length 5.6 mm., 

 tegmen 6.5 mm. 



Specimens examined: 17 males and 20 females, 1,000 ft. in moun- 

 tain forest near the Imperial Road, Dominica, B. W, I., June 11-30, 

 1939, June 15-29, 1940, Fennah (holotj^pe male, allotype female, 

 USNM 62010). 



This species differs from T. musca in markings, and from this and 

 all other described species in the shape of the male and female geni- 

 talia. It resembles T. borinquensis Dozier in the presence of a piceous 

 pronotal spot and in the shape of the anal segment of the male, but 

 differs strongly in the position and shape of the aedeagal spines. 



Thionia (Cheiloceps) laodice, new species 



Figures Z,i-m; b,v 



Of same size and bodily proportions as T. musca Uhler. 

 Vertex as broad as long. 



Light yellowish brown, obscurely speclded testaceous; two small 

 triangular areas at base of frons and a small spot behind each eye 



