194 THE CANADIAN ENTOMOLOGIST 



denticulate, the teeth coarser proximally but very minute and delicate on the 

 distal two-thirds of the blade. The tuberclp at the dorsal inner edge of the 

 pleurite bears three very long bristles that are but little shorter than the dorsal 

 pleural appendage. The gonapophyses and penis-guard are fused into a sub- 

 cylindrical tube that is armed caudalSy with several needle-like points. The 

 arrangement of these chitinized horns is about as in novehoracensis, but their 

 shape and structure is very different; appendage b is almost straight and has 

 the two arms of the bifid tip very unequal, the shorter one appearing as a small 

 spine at about mid-length of the appendage; appendage c appears forked at its 

 very base, the one arm very stout basally, near the apex narrowed and strongly 

 curved; the other fork is shorter, gradually pointed and flattened to the tip, 

 the margin with a thin l^ne of hairs. Below (ventrad of) the tube on either 

 side is a very large, flattened, nearly hyaline plate that is almost invisible in 

 balsam. 



Habitat. — California. 



Holotype. — cT, Wildcat Caiion, San Pablo, California, September 16, 

 1906, (J. Chester Bradley). 



The type is in the collection of Cornell University. 



The only described Nearctic species that is close to G. aciculifera is G. 

 novehoracensis Alex. (Can. Ent., Vol. 48, pp. 319, 320; 1916) of the northeastern 

 United States. The wing venatipn and the structure of the malie hypopygium 

 will easily separate the two forms. In this group of species, the male hypopygium 

 is very complicated ip structure, and I am unable to correlate the remarkable 

 structures that surround the penis-guard, with the gonapophyses found in other 

 groups of the genus. Very few specimens of these two species have yet been 

 discovered, and it. ere material is needed to finally decide these homologies. 



Genus Tricyphona Zetterstedt. 

 Tricyphona petiolata, new species. 



Size very small; antenucC dark brown, with fifteen evident segments, those 

 toward the. tip small and nearly globular; general coloration light buff, the 

 mesonotum with a singie conspicuous median dark brown stripe; wings nearly 

 hyaline; cell Rz petiol;ate; Ri perpendicular, at the very tip of R\\ cell Mi lacking; 

 cell 1st Ml open by the atrophy of m; abdomen brown, the hypopygium con- 

 spicuously light yellow. 



Male. — Length about 5.5 mm.; wing 6 mm. 



Rostrum and palpi dark brownish black, the former very short. Antenna? 

 dark brownish black, with fifteen evident segments, short, the first segment 

 elongate, the second enlarged, globular, the first fla-gellar segment elongate 

 ova ; those toward the end of the organ smaller and subglobular; the last seg- 

 ment is elongated and constricted medially as though formed by the close ap- 

 proximation of two small segments. Head brownish gray. 



Pronotum buffy, broadly dark brown medially. Mesonotum light bufty 

 yellow, the praescutum with a single broad, dark brown median stripe that is 

 narrowed at the tip and becomes obliterated before the suture; lateral pnescutal 

 stripes lacking. Pleura buffy yellbw. Hal teres paJb basally, the knobs dark- 

 brown. Legs with the coxae buff; trochanters light yellow; femora brown, 

 paler basaljy; tibia' and tarsi dark brown. Wings nearly hyaline, narrow; 

 stigma lacking; veins yellowish brown. Venation: Sc long, ending slightly 



