3- Diptera-Tipulidae from Juan Fernandez. 



By 

 Dr. CHARLES P. ALEXANDER, Urbana, Illinois. 



The crane-flies collected by Mr. K. Backstrom during the Swedish Ex- 

 pedition to the Juan Fernandez Islands 1916— 17, were kindly sent to me for 

 determination by Prof. Y. SjOSTEDT. There were but two species included in 

 the material but neither of these seem to have hitherto been found on the 

 adjacent mainland. The occurence of a species of Tipula on one of the lesser 

 oceanic islands at this distance from the coast of South America is of very 

 considerable interest. 



Family Tipulidae 

 Subfamily Limnobiinae 

 Tribe Limnobiini 



Genus Dicranomyia Stephens 

 Dicranomyia selkirki, sp. n. 



General coloration dark brown, the mesonotal praescutum reddish brown; 

 antennae black; wings brown, the stigma darker brown; vein Sc short, cell 

 I st Mj closed. 



Female. — Length 7,8 — 9 mm.; wing 10 — 11,8 mm. 



Rostrum brown, the palpi dark brown. Antennae black, the flagellar seg- 

 ments rounded-oval. Head brown. 



Mesonotal praescutum dark reddish brown, in some specimens with clearer 

 reddish stripes of which the median one is split by a capillary brown line; 

 remainder of the mesonotum dark brown. Pleura dark reddish brown. Halteres 

 moderately elongated, the knobs dark brown, the stems paler. Legs with the 

 coxae reddish brown; trochanters dark brown; remainder of the legs brown, 

 darkest on the tarsi; claws with a large, rather blunt, tooth at about mid- 

 length, with a series of about four much smaller teeth nearer the base. Wings 

 strongly suffused with brown, the stigma still darker brown, rectangular; veins 

 dark brown. Venation: Sc.^ ending just beyond the origin of Rs, Sc2 removed 

 some distance from its tip so that SC'^ alone is about equal to be. basal de- 



