555 
Having recently received several examples of both sexes, it was 
at once seen that the morphological characters of the palpi and tarsi 
were so markedly different from those of Monsoma that the species 
could no longer remain in that genus. 
The marked characteristics of Thomasina are that the palpi of 
the male are short , while those of the female are relatively long 
(figs, i and 2), the latter almost one-third the length of the 
proboscis; and that the fourth tarsal segment of the fore and 
mid-legs , in both sexes, is very small and flattened (fig. 3, a, b). 
c 
Fir. J. a and b. Fourth and fifth tarsal segments and ungues of the fore and mid legs of <J 
Thomasina longipalpis. (Newstead and Thomas.) 
c. Fifth segment and ungues of the same. 
We have much pleasure in dedicating this insect to our 
colleague, Dr. H. Wolferstan Thomas, who has contributed so 
much towards our knowledge of the mosquitos of the Amazon region 
at Manaos and elsewhere. 
Thomasina longipalpis (Newstead and Thomas) (1910)- 
Mansonia longipalpis (9 only) (Newstead and Thomas) (1910) • 
Male.— C olour and general characteristics as in the female. 
Palpi clothed with black, white, and ochreous-yellow scales, the 
* Ann. of Trop. Med. and Parasit.. Vol. IV, No. I. p- *45- 
