3°8 
Hominoxious Arthropods 
at rest. Cluster flies. P. rudis and related species, widely 
distributed . Pollenia R. D.* 
gg. Body metallic blue or green. Eastern Hemisphere. 
h. Vibrissal angle placed very high above the oral margin; a 
carina between the antenna*; outer posthumeral wanting; 
anterior intraalar present. T. viridaurea. Java . 
. Thelychceta Br. 
167. Horn fly. (a) egg; (2>) larva; (c) puparium; ( d ) adult. (X4). Bureau of Entomology 
hh. Vibrissal angle moderately high above the oral margin; 
carina small or wanting; no post humeral macrochaeta; 
lower squama hairy above. ( = Paracompsomyia 
Hough) (fig. 166) . Pycnosoma Br. 
ff. Gena bare. S. terminata. Eastern Hemisphere . 
. Strongyloneura Bigot 
ee. Stemopleurals arranged 2:1. 
f. Body metallic green or blue, with gray stripes; gena hairy to the 
lower margin; post humerals often wanting; lower squama bare 
above. ( = Compsomyia Rdi.) . Chrysomyia R. D. 
g. With one or two orbitals; height of bucca less than half the 
height of the eye. South and east U. S. (fig. 107) . 
. C. marcellaria 
gg. No orbitals; height of bucca about a third less than height of 
eye. West U. S . C. wheeler i Hough 
*Nitellia, usually included in this genus has the apical cell petiolate. A pollenia Bezzi, has 
recently been separated from Pollenia to contain the species P. nudiuscula. Both genera belong 
to the Eastern hemisphere. 
