LANTERNFLIES OF LESSER ANTILLES — FENNAH 35 



This subspecies differs from the typical subspecies in the broader 

 lateral lobe of the anal segment of the male and in the acute apex of 

 the aedeagus in profile. The coloring is closely similar, though the 

 frons of the female is less infuscate than that of the allotype of T. 

 musca musca Uhler. 



Thionia (Cheiloceps) clusiae, new species 



Figure S,a-d 



Of the same bodily shape and proportions as T. musca Uhler. 



Stramineous; median carina of frons, lateral carinae of vertex, and 

 anterior margin of mesonotum somethnes tinged orange; an ovate spot 

 behind eyes and a smaller spot anteriorly lateral of pronotal disc 

 fuscous. Tegmina subhyaline, tinged yellowish, in male very 

 lightly infuscate distally in areas between veinlets, in female more 

 distinctly infuscate between R and first claval vein; distal transverse 

 veinlets frequently pallid. 



Anal segment of male short, rhombic, anal foramen situated slightly 

 basad of middle, sides converging distally to subacute apex, in profile 

 both upper and lower margin very distinctly sinuate, apex acute. 

 Pygofer rather short with laterodorsal angles obtuse, not prominent, 

 lateral margins produced caudad at middle in an obtusely angulate 

 lobe. Aedeagus tubular, shallowly curved upward distally, in profile 

 narrowest at middle, dorsoapically membranous, devoid of processes; 

 a broad falcate lobe, sclerotized on its posterior margin, between pygo- 

 fer and base of anal segment on each side. Genital styles broad, 

 expanding distally, ventral margin straight, dorsal margin slightly 

 convex, apical process broad, distally acute with a short thin ledge 

 extending laterad from its anterior margin near base. 



Female genitalia as in T. musca Uhler. 



Male, length 6.2 mm., tegmen 4.5 mm. Female, length 7.9 mm., 

 tegmen, 5.5 mm. 



Specimens examined: 35 males, 43 females, and 18 nymphs on 

 Clusia sp. near active solfatara, Soufriere, St. Lucia, B. W. I., Mar. 

 22, 1939, Fennah (holotype male, allotype female, USNM 62009). 



This species is distinguished from T. musca by tegminal coloration 

 and by the shape of the male anal segment and aedeagus, as well as 

 by the absence of aedeagal processes. In general this species is rarely 

 encountered, but in the small enclave mentioned was observed to 

 maintain a relatively high popidation over a period of eight years, 

 when the opportunity for further observation ended. 



Thionia {Cheiloceps) medusa, new species 



Figure 3,e-h 



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

 Light brown, speclded testaceous; frons sublaterally infuscate with 

 pustules testaceous; a small triangle on each side of middle line at 



