LANTERNFLIES OF LESSER ANTILLES — FENNAH 25 



necessary to recognize two species, but there can be little doubt that 

 both have descended from a common Greater Antillean progenitor. 



In Cheiloceps there is little to indicate which Greater Antillean 

 species should be considered nearest, but the choice perhaps lies be- 

 tween Thionia ramosi Caldwell and T. borinquensis Dozier although 

 the coloration suggests affinity with Thionia ustulipunciata Uhler, new 

 combination, and T. argo Fennah. The position is clearer in Acanal- 

 onia, where the relationship between Aconalonia viriditerminata 

 (Lethierry) and the Puerto Rican agilis Melichar is extremely close, 

 while, as already mentioned. A, viequensis Caldwell has been re- 

 ported both from Vieques Island and from Antigua, B. W. I. It 

 is possible that this species has been derived from the same stock 

 that gave rise to A. plana Van Duzee in Jamaica. In view of the close 

 relationship between the Puerto Rican and Lesser Antillean issid faunas 

 it is surprising that no counterpart of the servillei-like forms of the 

 Lesser Antilles has been reported from Puerto Rico. The correspond- 

 ing form which is geogi-aphically nearest is A. rohusta Walker from 

 Jamaica. In Trinidad, to the south, there are two species of Acanal- 

 onia of generally similar appearance to the insular forms just men- 

 tioned. But the differences between either of these and any Antillean 

 species are very pronounced in points of detail, and it is evident that 

 no such close relationship exists as that between the Lesser Antillean 

 and Jamaican species. A similar observation may be made with regard 

 to Thionia, but no definite judgment can be formed about Colpoptera, 

 as only a single species, as yet undescribed, is known in Trinidad. 



Key to genera of Lesser Antillean Issidae 



1. Mesonotal disc twice as long as broad or longer; posttibiae laterally unarmed; 



vertex conically produced or not separated from frons by a carina; tegmina 



held subvertically in repose Acanalonia Spinola 



Mesonotal disc less than 1.5 times as long as broad; posttibiae almost in- 

 variably armed with one or two spines; vertex not conically produced, always 

 separated from frons by a carina; tegmina for most of length rounded- 

 tectiform in repose 2 



2. Form broadly ovate; wings very large with margin strongly indented twice and 



anal lobe larger than anterior lobe; posttibiae laterally bispinose. 



Thionia St&l 



Form narrow and elongate; wings not exceptionally large, with margin very 



feebly indented and anal lobe much smaller than anterior lobe; posttibiae 



laterally with a single spine, occasionally unarmed . CoJpoptera Burmeister 



Genus Colpoptera Burmeister 



Colpoptera Burmeister, Handbuch der Entomologie, vol. 2, p. 155, 1835. (Logo- 

 type, Colpoptera sinuata Burmeister, loc. cit., designated by Melichar, in 

 Wytsman, Genera insectorum . . ., fasc. 182, p. 92, 1923.) 



Neocolpoptera Dozier, Amer. Mus. Nov., vol. 510, p. 22. (Type species, Neocol- 

 poptera portoricensis Dozier, loc. cit., original designation.) 



