zoology of Fernando noronha. 
537 
slender at tbe base, gradually enlarging to the pulvillus, and 
about as long as the two preceding joints together. 
The species appears to be common, and differs considerably in 
size, the tegmina expanding from 30-40 millim., and the body 
measuring from 18-20 millim. in length. 
On both Main and Rat islands, but especially common on the 
latter. 
19. Pantala flavescens ( Fair .). 
Libellula flavescens, Fabr. Ent. Syst. Suppl. p. 285 (1798). 
Distribution . W orl d-wide. 
Very common everywhere on Main Island. The larvae living 
in puddles in the central district. 
20. Tramea basalis (. Bunn .). 
Libellula basalis, Burtn. Hanclb. Ent. ii. p. 852, n. 25 (1839). 
Less common than the preceding. The abdomen when fresh 
is dark crimson-red. A well-known South-American species. 
21. Blastophaga obsctjra, n. sp. 
Male. Long. corp. 2 millim. 
Brown or yellowish brown, smooth, except a few short hairs 
on the tarsi. Eront tarsi apparently 3-jointed, middle and hind 
tarsi 5-jointed; tarsal claws very strong, and front and hind 
tibiae ending in short strong spines. 
This species resembles the description of B. brasiliensis, Mayr, 
from Blumenau, but is considerably larger. I think it useless to 
give a detailed description, for which a larger series, including 
both sexes, and preserved in different ways, would be desirable. 
The locality will probably serve to fix the species, especially as 
true Blastophaga does not appear to be well represented in 
America. 
22. Ganosoma disbar, n. sp. 
Male. Long. corp. Ik millim. 
Yellow, smooth; head forming a long oval, broad behind, 
gradually narrowed in front, antennae inserted widely apart ; 
legs of nearly equal size and structure, femora slightly thickened ; 
tibiae spinose on the outer edge, and terminating in a coronet of 
short spines, none of which are conspicuously longer than the 
rest ; first joint of the tarsi longer than thick ; abdomen long, 
tapering. 
LINN. JOURN. — ZOOLOGY VOL. XX. 4J 
