114 American Midland Naturalist Monograph No. 3 



(96); Georgia (52); Kentucky (140); Louisiana (96); Mississippi (97); 

 Missouri (31); North Carolina (166); South Carolina (64); Tennessee 

 (125); Virginia (49). Other States: Colorado (128); Delaware (106); Iowa 

 (128); Maryland (19); Massachusetts (180); Michigan (88); Nebraska 

 (128); New Hampshire (105); New Jersey {77); New York (52); Okla- 

 homa (159); Pennsylvania (8); Rhode Island (99); Texas (130); Wisconsin 

 (48). 



bionomics. — The adults of this species have been collected in considerable 

 numbers in the southern states with New Jersey light traps and to a lesser 

 extent in diurnal resting stations. The larvae occur mostly in small permanent 

 bodies of water, particularly in swamps. This species is said to overwinter as 

 larvae under the ice farther north. Both larvae and adults occur throughout 

 the year in the South (4th Sv. C. Med. Lab. records, 1942-1944, unpublished). 



Genus Orthopodomyia Theobald 



Orlhopodomyia Theobald, 1904, Entomologist, 37:236. 



Orthopodomyia is a small genus widely distributed throughout the tropical 

 and temperate regions of the world. It is rarely found in large numbers due to 

 its restricted types of breeding habitats, consisting chiefly of water in tree-holes, 

 bamboo stems and leaf bases of Bromeliads. The adults of most species are 

 distinctly ornamented. This genus is represented in the United States by two 

 species, signifera and alba, which can be separated with certainty only in the 

 larval stage. 



salient characters. — Adult: Fourth segment of fore-tarsus very short, 

 only about as long as wide. Spiracular and postspiracular bristles absent. Post- 

 notum without setae. Squama fringed. Fork of vein 2 much longer than its 

 petiole. Tip of abdomen of female bluntly rounded, the eighth segment not 

 retractile. Male Terminalia: Apical margin of eighth tergite with a rounded, 

 median projection. Tenth sternite with several teeth at tip. Claspette absent. 

 Basal lobe small, armed with spines and setae; apical lobe absent. Larva: 

 Siphon without pecten; a single pair of subventral tufts present, never inserted 

 near base. Comb of eighth segment usually consisting of two rows of thorn- 

 like scales, those of the posterior row much longer. 



Key to the Species 



LARVAE (fourth INSTAR) 



Abdominal segment VIII with a large dorsal sclerotic plate; anal segment complete- 

 ly ringed by the dorsal plate; lateral hair of anal segment single 



signifera (Coq.) , p. 1 1 8 



Abdominal segment VIII without a sclerotic plate; anal segment not completely 



ringed by dorsal plate; lateral hair of anal segment 2 to 3-branched 



alba Baker, p. 1 16 



Orthopodomyia alba Baker 



Orthopodomyia alba Baker, 1936, Proc. Ent. Soc. Wash., 38:1. 



ADULT FEMALE. — ^Very similar to O. signifera. The only apparent differ- 

 ence in the females of the two species is found in the scales of the second 



