176 INSECUTOR INSCITli^ MENSTRUUS 



description of Vibrissomyia. Agrees quite well in coloration with de- 

 scription of lineata, but the following slight modifications may be noted : 

 Scutellum rufous to brick-fulvous, except only narrow basal margin. Fe- 

 male abdomen whoDy black on sides without red, or only slightly reddish 

 on first two segments ; that of male broadly red on second, posterior half 

 of first, and anterior half of third segments, the red bemg a shade or two 

 deeper than that of scutellum and more highly polished. 



Type, TD4 1 24 (fly, straplike uterus, black maggots). TD4 II 7 is 

 a cotype. 



This form necessitates the modification of the generic diagnosis of 

 Vibrissomyia to agree. Andinomyia still stands distinct on its much 

 more elongate head, wide parafacials, elongate cheeks, very long probos- 

 cis, absence of strong bristle-armature of anal segment. The present is 

 an example of subspecific evolution in anatomical and ordinarily generic- 

 value characters, without departing from the parent stock in type of col- 

 oration. One would be inclined to consider it a distinct species repre- 

 senting a subgenus of Vibrissomyia, were it not for the close agreement 

 in coloration with lineata, and perhaps that conception is correct rather 

 than the present. It affords another illustration of the difficulties that 

 beset the presentation of a true taxonomic picture in these fllies. 



(To be continued.) 

 Date of publication, December 7,1914. 



