ZOOLOaY OF FERTfANDO NORONHA. 



537 



slender at the base, gradually enlarging to the pulvillus, and 

 about as long as the two preceding joints together. 



The species appears to be common, and dilfers considerably in 

 size, the tegmina expanding from 30-40 milliin., and the body 

 measuring from 18-20 niillim. in length. 



On both Main and Rat islands, but especially common on the 

 latter. 



19. Pantala FLAVESCEis-s (Fabr.). 



Libellula flavescens, Fabr. Ent. Syst. Suppl. p. 285 (1798). 

 Distribution. World-wide. 



Very common everywliere on Main Island. The larvae living 

 in puddles in the central district. 



20. Tramea basalis (But^m.). 



Libellula basaUs, Burm. Handb. 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 obscura, n. sp. 

 Male. Long. corp. 2 millim. 



Brown or yellowish brown, smooth, except a few short hairs 

 on the tarsi. Front tarsi apparently 3 -jointed, middle and hind 

 tarsi 5-jointed ; tarsal claws very strong, and front and hind 

 tibise 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 Blastophar/a does not appear to be well represented in 

 America. 



22. Ganosoma dispar, n. sp. 

 Male. Long. corp. 1| millim. 



Yellow, smooth; head forming a long oval, broad behind, 

 gradually narrowed in front, antennse 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. 4] 



