310 
A Monograph of Culicidae. 
fork-cells short, the first sub-marginal cell a little longer and 
narrower than the second posterior cell, their stems about equal 
and their bases about level; the stems equal to about two-thirds 
of the length of the cells; sub-costal joins the costal some 
distance from the bases of the fork-cells and almost level with 
the supernumerary and mid cross-veins ; posterior cross-vein 
nearly twice its own length distant from the mid cross-vein; 
fringe brown, rather paler at the base, posterior border scales 
deep brown, rather long and narrow. Halteres with ochraceous 
brown stem, fuscous knob with grey scales. 
Length .—4 mm. 
Time of capture .—December (Urich) (102). 
Habitat. —Trinidad, at Agua Santa. 
Observations .—Described from a single perfect 9 i n beautiful 
condition. It forms quite a distinct species, coming near 
S. notoscripta, Skuse, in thoracic ornamentation, but clearly 
distinct from it in arrangement and also by the absence of the 
proboscis band and head ornamentation. I have seen no specimens 
from elsewhere. 
10. Stegomyia Marshallii. n. sp. 
Thorax dark chestnut-brown, with four silvery spots on the 
mesonotum and others on the pleurae ; there are also traces of a 
small third pair on the dorsum ; silvery scales on the scutellum 
and on the head; abdomen of 9 dark brown, unbanded, with 
silvery lateral spots ; in the £ some of the segments with basal 
silvery bands, others with white spots ; legs brown, with apical 
silvery bands to the joints. Palpi of the £ with the last two 
joints very short; ungues of the 9 blunt, equal, uniserrated in 
the fore and mid legs ; equal, simple in the hind legs. 
9 . Head black, covered with bronzy-black scales in the 
middle, two silvery-white patches in front on each side divided 
by a dull purplish and dusky ochraceous mass of flat scales, 
behind are some grey curved scales and numerous upright black 
forked ones; palpi short, covered with deep brown scales and 
bristly at the ends ; antennae, including the basal joint, deep 
brown, the latter with bright silvery-white scales forming two 
white spots ; proboscis bronzy-brown. Thorax almost black, 
covered with deep bright brown narrow curved scales, with 
four large clear spots of rather broader silvery-white scales, and 
two further back on the mesonotum not so distinct; pleurae deep 
