Genus Pneumaculex. 523 



Observations. — Reclescribecl from three females sent by 

 Dr. Lutz. 



It is a very beautiful species at once told by the thoracic lines 

 of silvery white and the dense long silvery tufts of hair-like scales 

 projecting from the scutellum. 



Genus PNEUMACULEX. Dyar (nom. nud.). 



Proc. Ent. Soc. Wash. VII., No. 1, pp. 45 and 46 (1905). 



Head with broad short curved scales, and much expanded 

 upright scales only, those at the sides of the head broader and 

 natter than elsewhere 5 but not spatulate and appressed as in 

 other Culicine genera. Palpi short in J ; long in $ , thin, no 

 hair-tuft, last segment very small, penultimate moderate, ante- 

 penultimate long. Male antennae plumose. 



Thorax with very scanty narrow-curved scales and lines of 

 more prominent rather natter and broader ones. 



Scutellum with the broader-scaled lines continued on to it, 

 otherwise nude ; two posterior border-bristles. 



Abdomen with broad spatulate scales. 



Wings with dense scales, many inflated. 



This genus closely resembles Dr. Lutz's Barter of tia in general 

 appearance, but is easily separated by the peculiar cephalic 

 squamose structure, the wing scales and the presence of scales all 

 over the niesonotum. 



The generic characters given by Dr. Dyar are of no value, as 

 such, being larval characters and the only adult ones being male 

 genitalia, so no one could place a female, nor for the matter of 

 that a male either unless dissected. 



The male sexual characters given are as follows : — " Side 

 pieces conic, without apical lobe ; basal lobe small but bearing 

 two stout setae ; terminal clasp slender, enlarged a little out- 

 wardly with a multiple articulated tip. Harpes short, chitinous, 

 concave, with trifid apex ; harpogones small, slender, chitinous, 

 acute ; another pair of appendages more basally placed, shorter 

 than the harpogones, with a terminal hook ; a median, divided, 

 double tipped membrane (unci ?)." 



The larva has besides a peculiar dorsal plate, an enlargement 

 of the tracheal tubes into a sort of bladder in the thorax, 

 suggesting Corethra. 



