June-Sept., 1919.] ALEXANDER: NEOTROPICAL CRANE-FLIES. 133 



by Messrs. E. B. and J. H. Williamson (see A Collecting Trip to 

 Colombia, South America, by E. B. Williamson: Misc. Publ. 3, Mus. 

 Zool., Univ. of Mich.; 1918). 



Costa Rica and Panama, several fine lots of specimens taken 

 by Dr. Axel Olsson. 



In addition to the above, considerable material was studied in 

 the collections of the American Museum of Natural History, mostly 

 from the Greater Antilles and British Guiana; the United States 

 National Museum from Chile (Porter), Panama (Busck and Zetek), 

 etc., and in the collection of Mr. Charles W. Johnson from the 

 Lesser Antilles (Ballou). I am greatly indebted to all the gentlemen 

 mentioned for the privilege of examining this material. Unless 

 stated to the contrary, the types are in the collection of the writer. 



Genus Dicranomyia Stephens. 

 Dicranomyia porteri new species. 



Antennae dark throughout ; mesonotal praescutum with the stripes con- 

 fluent, shiny brown ; pleura grayish ; abdomen dark brown, yellowish at the 

 end ; wings pale grayish with indistinct darker seams along the cord ; vein 

 Sc short, Sc 2 at the tip of Sc u cell 1st M 2 closed. 



Female. — Length, 6-6.5 mm. ; wing, 6-6.6 mm. 



Rostrum and palpi blackish. Antennas short, dark brown throughout, the 

 flagellar segments short-oval. Head dark brown, gray pruinose, the vertex 

 between the eyes very narrow. 



Mesonotum rather shiny brown, the usual three praescutal stripes con- 

 fluent ; humeral region and the lateral margins of the praescutum pruinose ; 

 scutellum and postnotum sparsely gray pruinose. Pleura pale brown, gray 

 pruinose. Halteres short, pale at the base and on the knobs, the stem brown. 

 Legs with the coxae and trochanters brownish-yellow ; remainder of the legs 

 light brown. Wings broad with a slight grayish tinge; stigma large, pale 

 gray ; indistinct and very pale gray clouds on the disk, darkest at the tip of 

 Sc x and the origin of Rs, paler and broader along the cord and the outer end 

 of cell 1st M.,. Venation: Sc short, ending opposite the origin of the sector; 

 Sc„ at the tip of Sc t ; r at the tip of R 1 ; Rs strongly arcuated to almost square 

 at its origin, about one-half longer than the deflection of /? 4+ . ; cell 1st M„ 

 large, closed, pentagonal to rectangular; basal reflection of Cm, inserted just 

 before the fork of M. 



Abdomen blackish-brown, the seventh to ninth segments and the valves 

 of the ovipositor conspicuously yellow. 



Habitat: Chile. 



Holotype, $, Antofagasta, May, 191 2 (Carlos E. Porter). 



Paratopotypes, 3 9$- 



Type in the collection of the U. S. National Museum. 



