84 DR. A. GUNTHER ON THE ZOOLOGICAL [Feb. 6, 
side and closely punctured. Wings fulvo-hyaline, their nervures 
dark ferruginous; the femora rufo- -piceous, palest towards their 
apex; the pubescence on the thorax and legs fulvous. The apical 
margins of the segments of the abdomen rufo- -piceous ; the pubes- 
cence fulvous. 
Albemarle Island, Charles Island (W. £. Cookson). 
Of Dierera, Commodore Cookson collected two species in Charles 
Island, one being the Musca ochricornis of Wied., the other appa- 
rently new— 
SYRPHUS ALBOMACULATUS. 
Length 4 lines. The front covered with silvery tomentum, as 
well as the posterior margin of the head behind the eyes. The 
thorax of a metallic blue-green; the scutellum rufo-piceous, with 
its posterior margin pale testaceous. Wings hyaline and splendidly 
iridescent ; the nervures dark fuscous. The legs rufo-piceous, with 
the anterior tibize, the base of the intermediate and posterior pair, 
and also the tips of the femora pale rufo-testaceous. Abdomen 
blackish brown, smooth and shining; at the base of the seeond and 
third segments laterally a large white isosceles-triangular macula. 
IX. Nevrorrera. By R. McLacuuan. 
Only two species collected; both are Dragonflies, belonging to 
the subfamily Libellulina. 
1. PANTALA HYMENZA. 
Libellula hymencea, Say, Journ. Acad. Philad. vol. viii. p. 19. 
Pantala hymenea, Hagen, Neurop. N. Amer. p. 142. 
One individual. In the ‘ Neuroptera of North America,’ Hagen 
records this only from Indiana, Western Texas, and Mexico. Later 
on, in his “ Synopsis on the Odonata of America”’ (Proc. Bost. Soc. 
Nat. Hist. vol. xviiii May 1875), he adds Illinois and Cuba as 
localities. In the ‘ Entomologist’s Monthly Magazine,’ vol. xi. p. 92 
(September 1874), I noted that Mr. G. F. Mathew, R.N., found the 
species at Payta, Peru, and says of it:—‘‘ This fine species occurred 
along the sea-coast. I cannot imagine where the larvze fed, as there 
was no fresh water within many miles of Payta, and rain is almost 
unknown there. Just above high-water mark, in some places, there 
were large patches of a species of Mesembryanthemum ; and these 
dragonflies were always to be found hawking above them.” I pos- 
sess an example from Chili. There can be little doubt that the 
species 18 migratory, though not to the same extent as its congener 
P. flavescens, which is found almost all over the world. 
2. TRAMEA, Sp. ? 
Three individuals. As these examples are in bad condition, and 
having regard for the difficulties that surround the group, I do not 
venture to describe them, although they possibly pertain to a new 
species, of large size (almost as large as Pantala hymenea), and with 
