A NEW SPECIES OF AGROMYZlDit 109 



Length of both sexes, 1.50 to 1.75 mm. in customary position which 

 does not include head and proboscis, the head being extended ventrally 

 from the strongly humped thorax. Head and proboscis of female less 

 than half body length, about 0.80 to 0.85 mm. ; of male about 0.60 mm. 



Described from three dry-mount females and four balsam-mount fe- 

 males captured indoors by lamplight at the mouth of Verrugas Canyon on 

 the night of July 9, auid one dry-mount male captured in a dark recess 

 of ravine wall at bottom of Verrugas Canyon under railway bridge (Ver- 

 rugas Bridge of the Central Railway) on the forenoon of July 10, 1913. 



It may be noted that the body and wing surfaces and hairs aire irides- 

 cent in sunlight as seen with the 65 magnification of the binocular, the 

 wing surfaces and leg surfaces appearing reticulate-iridescent, the tarsal 

 joints most beautifully violet-blue varying through all shades of green to 

 cupreous in very oblique sunlight. Considering the fact that these gnats 

 never venture into the sunlight, so far as is at present known, the wonder- 

 ful color effects which they display would seem to be entirely lost to their 

 perception. It is probable, however, that their mating operations take 

 place about sundown, and that the diffused daylight at such times allows 

 their perception of these color effects in a certain degree. 



The three figures were drawn by Miss Helen T. TowTisend, with 

 camera lucida, from balsam mounts. 



Note. — Since the above was written, the successful transmission of 

 verruga by the above described species has been accomplished in a dog, 

 injection being given on July I I and eruption appearing on July 1 7. 

 This establishes the complete demonstration of the species as the vector 

 of verruga. 



A NEW SPECIES OF AGROMYZIDiC 



(Diplera) 

 By J. R. MALLOCH 



Milichia orientalis, new species. 



Female : Brownish-black, subopaque. Frons gray dusted ; face thickly 

 white dusted. Mesonotum with gray dusting, in some aspects with an 

 olivaceous or greenish tinge ; pleurae with dusting slightly greenish and 

 iridescent ; scutellum colored as disk of mesonotum. Abdomen more dis- 

 tinctly shining thcin thorax, the dusting most distinct at base. Legs and 

 halteres black. Wings clear, veins brown. 



