— 83 — 



D. Front coxae transverse. — Leptinotarsa. 

 DD. Front coxae rounded ; 3rd tarsal joint bi-lobed. — Fidia. 

 CC. Antennae rather close at base ; front coxae conical. 



D. High thighs slender and front coxa'l cavities open behind. 

 E. All the tibiae without terminal spurs. — Galerucella. 

 EE. Middle and hind tibiae with terminal spurs. — Diabrotica. 

 DD. Hind thighs thickened. 



E. Front coxal cavities open behind. 



F. Thorax with a feeble transverse impression on basal 



half ; hind tibiae with a short terminal spur — Haltica. 



FF. Thorax without transverse impression near base; 



elytra usually with a yellow stripe or spots — Phyl- 



lotreta. 



EE. Front coxal cavities closed behind. 



F. Thorax with a distinct transverse impression near 

 base; elytra with rows of stiff hairs; form short, 

 ovate — Epitrix. 



MUSCIDAE. 



Common Genera. 



A. Proboscis long, slender, directed forward ; arista pectinate. 

 B. Palpi nearly as long as the proboscis — Haematohia. 

 BB Palpi much shorter than proboscis — Stomoxys. 

 AA. Proboscis not elongate, labella fleshy and not adapted for sucking. 



B. Arista plumose ; hypopleurae with a vertical row of bristles ; eyes bare. 

 C. Thorax and abdomen with depressed hairs among the bristles — 

 Pollenia. 

 CC. Thorax and abdomen without such hairs ; mesonotum distinctly 

 striped ; bright metallic — Chrysomyi-a. 

 BB, Arista plumose; hypopleurae without a row or tuft of bristles. 

 C, Last section of 4th vein has a rounded angle — Miisca. 

 CC. Last section of 4th vein curved forward, often slightly, beyond 

 its middle or at the tip, the cell broadly open ; the first longitu- 

 dinal vein ending beyond the middle of the wing — Muscina. 

 BBB. Arista plumose ; hypopleurae and eyes as in B. 



C. Mesonotum flattened behind the transverse suture; posterior 

 dorsocentral and acrostical bristles inconstant and unequally 

 developed — Phormia. 

 CC. Mesonotum not flattened behind the transverse suture; pos- 

 terior dorsocentral and acrostical bristles well developed and 

 constant. 

 D. Cheeks hairy ; 3rd longitudinal vein spinulose at base 



only — Cailiphora. 

 DD. Cheeks bare ; 3rd longitudinal vein spinulose — Lucilia. 



