Al.DRK'H AND DARLINGTON. 73 



flECOTHEA Haliday. 



Dorsocentral bristles 4 (3 beliind the suture) ; liuineral 1; noto- 

 pleural 2; presutural 1; propleural 1; supra-alar 3; scutellar 2 

 pairs, the apical divergent; prescutellar or minute; f'ron to-orbital 

 1 ; on the middle tibia near the middle one on the hind side and 

 several on the front. Head rather flattened in front, short in fore 

 and aft measurement ; eyes smallish, round ; cheeks about half or 

 three-fifths as wide as the eye. Front very wide. Antennie rather 

 large, third joint not quite round, with long, thin, bare arista. Oral 

 margin prominent. No bristle on cheek. Scutellum elongate. 

 Wings of the usual forn), costal spines strong, the hind apical angle 

 of the discal cell generally acute. 



The spines on the middle part of the middle tibia are the chief 

 mark of generic distinction ; they occur in no other genus of Helo- 

 myzidse. 



We have but one species. 



4Ecothea fenestralis Fallen. 



Blepharoptera specus Aldrich, 21st Eept. Geol. Ind., 1896, 189. 



Length 4.5 mm. ; of wing, the same. 



General color brown, legs and feet yellow. 

 . Front brown above„yellowish toward the antennae, with rather coarse black 

 hairs all over ; face light yellow, the distinct antennal grooves darker, a single 

 strong vibrissa on each side; palpi yellow; antennae dark brown. 



Thorax brown on the dorsum, the humeri, entire scutellum, and edges of 

 notum yellow; scutellum with coarse hairs on its dorsal surface; pleura; largely 

 yellow, the mesopleura and sternopleura darker; mesopleura bare, sternopleura 

 with one bristle and scattered hairs; pteropleura bare; halteres yellow. 



Abdomen darker brown, narrowly whitish on the hind edges of the segments, 

 sixth segment and beyond yellow. 



Legs wholly yellow, including coxae and tips of tarsi. 



Wings yellowish, veins yellow, cross-veins darker but not distinctly bordered. 



The specimen described is perhaps a little lighter in color than 

 the average; there is considerable variation in the intensity and 

 extent of the brown. The tarsi are sometimes iufuscated toward 

 the apex, and the scutellum is not always yellow at tlie base, etc. 



Twelve specimens, both sexes. Aldrich : Brookings, S. Dakota ; 

 Porter and Wyandotte Caves, Indiana. Johnson : Brookline, 

 Mass. U. S. N. M. : Algonquin, 111. 



The Indiana cave specimens are cotypes of Blepharoptera specus 

 Aldrich. Blatchley adds a note to the original description as fol- 

 lows : " The species of Blepharopterse were the largest and most 



TEANS. AM. ENT. SOC. XXXIV. (10) MARCH, 1908. 



