DIPTERA OF BAJA CALIFORNIA. 615 



a broad median area and an isolated lateral spot black. 

 Venter with four median black spots, the anterior one at 

 base of second segment small, the second and third (on 

 posterior borders of second and third segments respect- 

 ively) successively larger, and that on anal segment very 

 large. 



El Taste, Baja California (Eisen). September. Two 

 males in company with many V. megaccphola. These 

 agree well with the Arizona specimen. One. however, 

 has the facial stripe obsolete. 



41. VOLUCELLA LUCASANA n. Sp. 



El Taste, Baja California (Eisen). September. One 

 $ . Length, 8 mm. This species differs from K tolteca 

 as follows : 



Length, 8 mm. A blackish vertical stripe down the 

 eyes. Cheeks yellow with a broad black stripe ante- 

 riorly, broader above. Median facial stripe broadened 

 above. Scutellum wholly blackish. Legs wholly black- 

 ish, the bases of front and middle tibia? slightly tawny. 

 Wings with a brown cloud on anterior outer half, follow- 

 ing the distal veins of wing posteriorly to discal cell, and 

 embracing a cloud on small cross- vein and a very much 

 fainter one on cross -veins at distal end of second basal 

 cell. Discal cell hyahne, first posterior mostly hyahne, 

 submarginal narrowly hyaline on proximal portion. 



42. VoLUCELLA MEGACEPHALA Lw. , Willist. El 



Taste, Baja California (Eisen). September. Sixteen 

 females and fourteen males. These seem to agree with 

 the three specimens from Arizona and Mexico mentioned 

 by WilHston in his monograph (p. 146), except that there 

 is a faint median pair of vitt^ on thoracic dorsum between 

 the broadly separated vittjE. There are fine black bristly 

 hairs on lower edge of margin of scutellum. This spe- 



