318 THE CANADIAN ENTOMOLOGIST 



pale pubescence that is most noticeable on the basal scj^^ments. 

 Head yellow with a dark brown median mark. 



Pronotum \ellow, slij2:htl\' tlarkencd medialK'. IVIesonotal 

 prascutum yellow with three dark brown stripes, the lateral pair 

 being almost conlluent with the broad middle stripe; lateral stripes 

 removed from the margin of the sclcrite and beginning just back 

 of the pseudosutural fo\ea'; the latter is elongate rectangular, 

 chestnut in colour; scutum N'ellow, the greater portion of each 

 lobe brown; scutellum brown baSalU', the caudal half \ellow; 

 postnotum brown, the sides of the sclerite yellow. Pleura light 

 yellow with two dark brown stripes as follows: dorsal stripe 

 narrow, ckvir-cut, l)eginning on the cervical sclcritcs, rimning 

 backward just abo\e the base of the fore cox;c and above the base 

 of the halteres; the %entral stripe occupies the mesosternum and 

 is of. a much paler brown than the other stripe; the yellow stripe 

 enclosed is \ery pale, suffused with whitish. Halteres pale, the 

 knobs slightK- infuscated. Legs with the coxiv and trochanters 

 light yellowish brown, the fore coxa- whitish yellow on the outer 

 face; femora, tibia* and tarsi very pale brown, the latter dark 

 brown on the last three segments. Wings nearK* Inaline, the 

 stigma indistinct, the veins brcnvn. Venation: Sc short, ending far 

 liefore the origin of Rs, this distance about equal to vein R2 alone; 

 Ijasal deflection pf Ri+b \ery short or lacking; basal deflection 

 of Cui beyond the fork of M, this distance a little shorter than the 

 first deflection of J/11-2; cell ]st M2 open. 



Abdominal tergites dark brown, the terminal "segments slightly 

 margined with yellowish; sternites light >ellow. Hypopygium 

 with the pleurites rather long and slender, the dorsal angle produced 

 caudad as a flattened, fleshy lobe that bears many hairs on the 

 dorsal face; appendages two, the first appendage very long, flattened, 

 the apex Lent, the surface of the arm with many long hairs; second 

 appendage complex consisting of a chitinized hook that is slightly 

 bent; underneath the base of this hook is a fleshy lobe with several 

 short bristles on the outer face; above the base of the hook is a 

 slender subchitinized rod that is darkened at the tip. 



Habitat — Western United States. 



Holotype — cf, Monterey Co., California; July 18, 189G. 



