370 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



30. Cnemodon albipleura, new species (Figs. 100, 101) 

 Habitat: California! Differs from auripleura in hav- 

 ing broader middle tibiae, front less swollen above the 

 antennae, frontal depression circular and deeper and pile 

 of the venter appressed, not sub-appressed. 



From pisticoides it differs as from auripleura but the 

 pile of the venter is appressed in both species. 



Female: Length, 5.5 mm. Face and frons shining metallic greenish black, 

 whitish pilose; frons black pilose except across the middle and at the vertex; 

 the depression on the frons well marked, much deeper in the middle than in 

 most species and more shallow at the sides where it is almost obsolete, although 

 a distinct transverse line can be observed when viewed from above. Face 

 considerably receding, epistoma slightly produced. Antennae black, tip of 

 second joint luteous, third below broadly yellow at base, in shape slightly 

 longer than wide; arista luteous at base; eyes inconspicuously pilose; occipital 

 cilia white. Thorax and scutellum shining black, white pilose; scutellum with 

 well marked apical groove. Abdomen shining black, very short white pilose; 

 broad apical area on second and third segments not reaching the sides, with 

 black pile. Legs black; tips of femora, base of front and hind tibiae, broad base 

 of middle tibia?, with tips of the front four, and first two joints of their tarsi, 

 reddish yellow. Wings slightly brownish; stigma luteous; last section of fourth 

 vein bent near its basal quarter; of the fifth oblique, slightly sinuous. Halteres 

 yellow. Middle tibia* strongly rounded in front, more so than usual, the frons 

 less rounded than in allied forms. 



One female specimen from Mr. W. M. Davidson, 

 dated, "16 viii, 1911." Of this specimen he writes: 

 "The specimen without locality record was collected in 

 California, I think at San Jose, but am not positive." 

 Type placed in the United States National Museum. 



31. Cnemodon carinata, new species (Fig. 59) 

 Habitat: Ontario! Black, shining and opaque; apical 

 third of third abdominal segment and immediate base 

 of fourth, below, carinate; face white pilose. 



Male: Length, 6 mm. Face and frons shining black; face rounded above, 

 receding, sides narrowly whitish pollinose, white pilose; a few black hairs at 

 sides of the mouth; front moderately swollen, black pilose; a very conspicuous 

 pit above the base of the antennae. Antennae black, third joint obscurely 

 yellowish at base below, in shape oval; arista black. Vertical triangle whitish 

 pilose, a few black hairs in front; eyes black pilose, below whitish; posterior 

 orbital pile cinerescent; occipital cilia black. Thorax and scutellum shining 

 greenish black; white pilose. Abdomen shining slightly purplish black; pile 

 white, the usual areas black pilose, the usual opaque areas indefinite; the light 

 pile cinerescent in some lights. Legs black; tips of all the femora, base of all 

 the tibiae, whole of the anterior ones in front, tips of anterior four and first 

 three joints of their tarsi, yellow; pile white except at ends of the femora where 

 it is blackish. Wings hyaline; stigma luteous; last section of fourth vein almost 

 parallel to margin of wing; of the fifth straight. 



Holotype, male, No. 864, Mus. Calif. Acad. Sci., June 

 22, 1919, H. Curran, collector. Paratypes, three males; 



