259 
Genus Psorophora. 
Dr. Lutz writes me that “ it occurs in damp woods and 
shady river shores. It stings in the daytime. The larva is 
green. Common in Brazil.” 
4. Janthinosoma discrucians. Walker. 
(Vide Appendix.) 
Genus 6.— PSOROPHORA. Robineau Desvoidy. 
(Essai sur les Culicidcs, Mem. cl. la Soc. d’Hist. Nat. de Paris, iii. p. 412 
(1827), R. Desv.; Dipt. Arg. Revista d. Museo d. 1. Plata, p. 38 (1891), 
Arri.; Reg. An. p. 440 (1829), Latreille.) 
Head covered with small broad curved scales and upright 
forked ones ; mesothorax with curved scales in the middle with 
short broad scales laterally ; abdomen with small flat spatulate 
scales • antennae rather short in both sexes, in the $ the two 
last joints elongated as in Culex ; palpi (Fig. 77) short in the 9 ? 
long in the £ , longer than the proboscis in the J , five-jointed, 
the first (or basal) joint very small, the third long, slightly 
enlarged apically; the fourth and fifth joints thick, the two 
nearly equalling the third in length ; in the 9 the palpi are 
four-jointed, but short, never more than one-half the length of 
the proboscis ; the first and fourth joints are very small, the 
third longer than the second. According to Desvoidy and 
Arribalzaga, the palpi of the 9 are five-jointed, but I have failed 
to detect the second small basal joint figured by Arribalzaga. 
The proboscis is short and rather thick in the £ ; longer and 
bent in the 9 • The prothoracic lobes are said to have lateral 
appendages which protect the stigmata of that segment. Wings 
with the scales rather long and thin; first sub-marginal cell 
short, only a little longer than the second posterior cell; the 
posterior cross-vein close to the mid cross-vein, but always a 
little nearer the base of the wing than the mid. Legs with the 
apices of the femora and the tibiae and to some extent the 
metatarsi with long scales; ungues of the 9 ah equal, thick, 
with a large distinct tooth to each, in the $ the fore and mid 
claws unequal, the larger one twice as long as the smaller and 
with two teeth, the smaller with one tooth or simple; hind claws 
equal and single toothed. 
This genus was instituted by Robineau Desvoidy in 1827, and 
