Vol. XXIV] ENTOMOLOGICAL NEWS 455 



the anterior margin of the cephalothorax to the level of the third 

 coxae; it is bent upon itself just before the stigma is reached. Stigmal 

 plate extending but little beyond the stigma, truncate at this end and of 

 about equal width throughout its length, and bearing two obscure hairs, 

 one on each side of the stigma. Metasternalia present, small, triangular ; 

 each bearing a simple, curved seta. Genital plate semidisc-shaped, with 

 a single pair of bristles. This plate is situated directly between the 

 fourth pair of coxae, and joins the anal plate along a straight, trans- 

 verse suture. Anal plate large, somewhat shield-shaped ; with four 

 pairs of bristles. Anus circular, situated near the posterior margin of 

 anal plate, surrounded with a thickened border of chitin in the form of 

 a collar; at the outside margin of the collar is situated one of the 

 four pairs of setae found on the anal plate. 



Legs stout; anterior pair as long as the body; second pair about 

 three-fourths as long, but much thickened ; third pair subequal in 

 length to second ; last pair equal to the first in length, and extending 

 beyond the posterior margin of the abdomen by the full length of its 

 last two segments. Tarsus of leg I slightly longer than tibia, and end- 

 ing in several tactile hairs ; tibia considerably longer than patella ; pa- 

 tella subequal to femur. The tarsi of the last three pairs of legs each 

 bear a stout pair of claws, between which is situated an expanded, 

 hyaline pulvillus. The spines toward the end of tarsus of leg II are 

 suddenly narrowed near their tips, and end in strongly chitinized, 

 thorn-like processes. Length of body, 0.97 mm. ; width, 0.62 mm. 



From Ithaca, New York, on Musca domestica, by Dr. J. F. 

 Illingworth and by the writer. From Corvallis, Oregon, on 

 Musca domestica, by the writer. 



Description made from five female specimens, one of which 

 was dissected. This species is quite distinct from any of our 

 known American forms. I find that according to natural ar- 

 rangement it comes next to Macrocheles muscorum Ewing, in 

 my collection. It differs from this species in being about twice 

 as large, in having triangular metasternalia instead of circular, 

 in having the anal plate subshield-shaped instead of being 

 oblong oval, as well as in many other particulars. 



BIBLIOGRAPHY. 

 Banks, N. 1904 A Treatise on the Acarina, or Mites. Proc. U. S. 



Nat. Mus., Vol. XXVIII, pp. 1-114. 

 Banks, N. 1905 Descriptions of Some New Mites. Proc. Entom. 



Soc. Wash., Vol. VII, pp. 133-142. 



