AMERICAN DIPTERA. 



35 



M. angustm Mcq. has legs with green reflections, and tarsi bLack. 



When I say that the scutellar spines are not widely separated, I 

 mean that they are not nearly so remote as shown in v. d. Wulp's 

 figure of M. aurifex in the Biol. Cent.-Am., Dipt. iii. 



4. Micro«loii virldis Towns. 



San Jose del Cabo, 'Baja, Cal. (Cal. Acad. Sci.). One female. 

 See description in Proc. Cal. Acad. Sci., 1894. 



5. IIIi<^roclon xaiitliopiluin Towns. 



California (Acad. Sci. ). Two, % 9 . Differs from mecjalogader 

 Snow by having abdomen yellowish pilose. For description see 

 Proc. Cal. Acad. Sci., 1894. 



6. €hrysotoxuiii derivatuiii Walk. 



Fort Collins, Colorado ^ Gillette). One male I refer to this species. 

 It is 15.5 mm. long, not including antennae. The pile of thorax 

 seems to be all yellowish. The yellow on fifth segment encloses an 

 inverted Y-shaped marking, the base of the Y being confluent with 

 the narrow anterior black border of the segment. The yellow of 

 second to fourth segments agrees with Williston's description. 



7. Chrysotoxiiui laterale Loew. 



Guanajuato, Mex. (A. Duges). One male. This specimen is ap- 

 parently the same as those from Mexico mentioned by Williston in 

 the Biol. Cent.-Am., Dipt, iii, p. 5. It is nearly 12 mm. long, and 

 agrees in all the particulars there mentioned. Scutellum yellow, 

 disc glassy, but nearly concolorous. Margin and base of venter 

 rather broadly yellow, the posterior margin of segments yellow, third 

 and fourth with a pair of yellow spots. Frontal triangle black, 

 narrowly yellow pollinose on sides. 



8. Clirysotoxiim pubescent Loew. 



Constantine, Mich., August 31, one female. Dixie Lauding, Va., 

 May 30, one male. I refer these here rather than to veniricomiii 

 because they agree in size and the coloring of the legs, though the 

 black of fifth segment forms an inverted Y and not a V. I believe 

 the coloring of the legs is a better specific cliaracter than the inter- 

 ruption or non-interruption of the band of fifth segment, especially 

 when combined with size. The length of these two specimens is 

 12 mm. The second joint of antennae is longer than the first, but 

 the third joint is no longer in the male than in the female. In all 

 other respects they both agree closely with Loew's description. 



TRANS. AM. ENT. SOC. XXII. MARCH, 1895. 



