182 >:;:\y VOIIK STATE .\irsr:r.M 



Imago. Kather large to very snmll species, characterized by the 

 structure of their antennae and the win<; venation. Head small, 

 somewhat compressed laterally; epistome somewhat prominent, 

 and usually hairy: prolmscis short ; palpi incurved. four jointed, 

 the last joint somewhat elongated. Antennae of the male 14- 

 jointed, the lirst joint large. disk-like; the second cylindrical, 

 the following ones rounded and closely crowded, the last joint 

 very long. often as long ;is the others taken together; all long 

 plumose; that of the female 7 jointed, the lirst disk-like, the second 

 cylindrical, the following egg or pear-shaped, short verticillate, 

 the hist one cylindrical or ellipsoidal, short-haired; eyes reniform. 

 ocelli .-ire wanting. Mesothorax highly an-hed. projecting over 

 the head, without transverse suture, with a depressed area in 

 front of the sen lei him : the pec t us deeply arched, scut id him small; 

 metanolum \\ell developed. Abdomen long and narrow, com- 

 pressed cylindrical. X-jointed; h\popygiuin long-like. Legs very 

 slender and long, especially the anterior pair, which are widely 

 separated from the following pairs; coxae elongated, the lihiae 

 sometimes very short, and the metatarsi often much elongated, 

 the vesture woollv and short, sometimes fringe-like ; claws and 



* 



pulvilli present. Wings long and slender, hairy or hare, folded 

 over the abdomen when a! res! ; in the male oflen shorter than 

 the abdomen. Venation as in the figures on pis. 28. 20. .'50, and 

 31; anal angle present ; the halteres free. 



A^an der Wnlp (1874) divided this group into a number of genera, 

 using as characters for the subdivisions the relative length of 

 the fore tibia to the metatarsus, the condition of the wing, i.e., 

 whether hairy or bare, and the course of the cubitus. Descrip- 

 tions of these genera are given on subsequent pages. 



Genus 37. Thalassomyia Schiner 

 Verb. zool. bot. Gesell. G:218. 1856 



This genus was erected by Schiner (loc. cit.) to contain the 

 species T, frauenfeldi, of which only the female was 

 known. More recently I)r Tomosvary (1884) described another 

 species T. congregata, , and in 1903 the writer described 

 the male and female of a third, T. o b s c u r a . Ooquillett 

 (1902) described a fly which he called Orthoicladius 



