3°6 
Hominoxious Arthropods 
i. Dorsocentrals six; last section of R4+5 with a gentle curve, 
j. Inner dorsocentrals (“acrostichals”) wanting; sterno- 
pleurals arranged 1:3. P. cyanicolor, cadaverina, etc. 
Europe and America. Pyrellia R. D. 
jj. Inner dorsocentrals (“acrostichals”) present; stemo- 
pleurals arranged 1:2. E. latreillii. North America. 
. Eumesembrina Town. 
ii. Dorsocentrals five; inner dorsocentrals present; last 
section of R4+5 with a rounded angle; stemopleurals 
arranged 1:2. P. cornicina Europe and America. 
{Pseudopyrellia Girsch.). Orthellia R. D. 
ee. Middle tibia without a prominent bristle on the inner surface beyond 
the middle. 
166. Pycnosoma marginale. (X4.) After Graham-Smith. 
f. Squamula thoracalis broadened mesad and caudad as far as the 
scutellum. 
g. Stemopleural macrochsetae arranged in an equilateral triangle; 
front of both sexes broad; gense bare; dorsocentrals six, 
small; wing not rilled. (To Coenosin.®). Atherigona Rdi. 
gg. Stemopleural macrochaetae when three are present, arranged 
in a right triangle. 
h. Last section of R44-5 with a more or less rounded angle 
(fig. 163I). 
i. Eyes of the male pilose or pubescent, of the female nearly 
bare; m-cu crossvein usually at or proximad of the mid¬ 
distance between the r-m crossvein and the bend of 
R4+5. P. (= Placomyia R. D.) vitripennis . 
.. Plaxemyia R. D. 
ii. Eyes bare; the m-cu crossvein always nearer to the bend of 
R4-I-5 than to the r-m crossvein, 
j. Apex of the proboscis when extended reveals a circlet of 
stout chitinous teeth. P. insignis Austen, of India, 
bites both man and animals. (= Pristirhynchomyia) 
. Philaematomyia Austen 
