192 THE CANADIAN ENTOMOLOGIST 



very broad and flattened with the dorsal surface minutely roughened into 

 tiny spines or raised scales that are more prominent, subserrate, along the 

 outer margin. Ventral pleural appendage powerful, acute, shiny black, straight 

 basally, suddenly narrowed to the acute tips which are directed ventrad, the 

 concave face weakly toothed. 



Habitat. — California. 



Holotype. — -c^, Alpine, San Diego County, California, April 9, 1915, (M. 

 C. Van Duzee). 



Paratopolype. — Sex uncertain. 



The type is in the collection of Mr. Van Duzee. 



Additional specimens of a clpsely related form from the Muir woods, Marin 

 County, California (May 19, 1915, M. C. Van Duzee) agree closely with this 

 species in general characters, but are much more reddish in their general colour, 

 the dorsal pleural appendage not so broad, and the ventral pleural appendage 

 with about three or four large spinules before the tip. Molophilus squamosus 

 is a small, delicate species, allied to M. pauhis Bergroth, but readily distinguished 

 by the very broad, dorsal pleural appendages and the differently constructed 

 ventral appendage. From M. spiculatus Alex., M. comatus (Doane) and other 

 allied forms it is told by its much smaller size and slightly different structure 

 of the male hypopygium. 

 Molcphilus bispinosus, new species. 



Antenna of the male short; general coloration light brown; ma.e hypopy- 

 gium with the lobes of the ninth tergite produced apically into straight, slender 

 arms; dorsal pleural appendage elpngate, very straight and siender, acute at 

 the tip; ventral pleural appendage powerful, sickle-shaped, the concave face 

 with strong spinules. 



Male. — Length about 4 mm.; wing 5.5 mm. 



Rostrum and palpi brown. Antennae of the male short, the scape brownish 

 yellow, the flagell/ir segments dark brown, clothed with a long pale pubescence. 

 Head with the front yellow, vertex and occiput gray. 



Pronotum pale. Mesonotum light brown, the tuberculfite pits black, 

 widely separated. Pleura grayish brown. Halteres pale. Legs brownish 

 yellpw, the tips of the tarsi darkened. Wings subhyaline; a faint blotch of 

 dark hairs on the radial cross-vein and another on the radial-median vein; a 

 faint cloud at the basal deflection of Cm; veins dark brown, subcosta yellpw. 

 Venation: basal deflection of i?4+6 and r-m in alignment; fusion of Cin and Ms 

 a little shorter than Cu\ beyond the fork. 



Abdomen dark brown, the hypopygium reddish yellow. Male hypopygium 

 with the tergite profoundly split medially as in the genus, the halves thus formed 

 with the tips rather narrow, directed proximad so as to be almost contiguous 

 on the median line; each lobe on the sides at the apex produced caudad into a 

 slender, flattened, straight, fleshy Ipbe whose inner margin is fimbriate. Dorsal 

 pleural appendage slender, elongate, almost straight beyond the enlarged base, 

 the tips acute. Ventral pleural appendage powerful, strongly curved, the 

 subacute apex directed ventrad, the ventral or concave face with several equi- 

 distant large and acute spinules. 

 Habitat. — California. 



Holotype.— &, Berkeley, California, May 25, 1915, (M. C. Van Duzee). 



