i 4 H. STEMPFFEK 



Male genitalia of C. neavei (Text-fig. 6) : uncus crescentic with an almost straight anterior 

 margin ; subunci long, curved, tapering regularly ; tegumen triangular, separated from the 

 uncus by a membrane which is translucent under the microscope ; vinculum fairly wide, saccus 

 triangular, turned towards the apex of the abdomen and not towards the eighth segment ; valves 

 oblong, the two processes separate at the apex, the apex of the upper process rounded, that of the 

 lower one more pointed ; penis elongate, ending in a sharp, slightly curved point ; uncus and 

 apices of valves densely pilose. 



In C. aliciae the© fore legs are like those of C. neavei, and the male genitalia (Text- 

 fig. 7) almost identical with those of C. neavei, except that the lateral angles of the 

 uncus are more rounded. 



The male genitalia of these two species are of the commonplace pattern, totally 

 different from that found in species of Telipna and Pentila, in which the genitalia are 

 highly specialized. There is, therefore, no good reason for leaving the genus 

 Cooksonia in the company of the above two genera, the only character it has in 

 common with them being the presence of a precostal vein in the hind wing, a 

 character which, incidentally, was not mentioned in the description of the genus but 

 which nevertheless is present in the three known species. 



The chrysalis of C. aliciae has been described and figured by Talbot (1935 : 204, 

 pl. V, fig. 3). 



List of Species of Cooksonia 



*Cooksonia aliciae Talbot, 1935, Entomologist's mon. Mag. 71 : 203, fig. 

 *Cooksonia neavei (H. H. Druce), 1912. 



Cooksonia trimeni trimeni H. H. Druce, 1905. 



Cooksonia trimeni terpsichore Talbot, 1935, Entomologist's mon. Mag. 71 



204. 



Fig. 7. Cooksonia aliciae Talbot, o* genitalia. 



