SUBFAMILY MESEMBRINELLINAE 65 
Front of male 0.02—0.023 of head width, without fronto- 
orbital bristles; female with two or three proclinate 
PEOULOUGOLUL MOLISE LES: nay ae eh, Wek. te: SIN Oe 
5. Fourth abdominal segment with a row of strong discal 
INS ES ae Sek OR aS CR, Om Re let i an ee 6 
Fourth abdominal segment with only marginal bristles... .8 
6. Femora, pleura, and abdomen blue-green to blackish. ...7 
Femora, pleura and base of abdomen yellow orange........ 
RT eee Huascaromusca tibralis (Ald.), p. 81 
7. Two to three rows of postocular cilia; only one lateral 
seutellar bristle; thoracic spiracles with orange hair.... 
Sart ie Neat ita echaratae Huascaromusca uniseta (Ald.), p. 84 
Only one row of postocular cilia; with two lateral seu- 
tellar bristles; thoracic spiracles with dark brown hair 
Ph aay sO aah. Huascaromusca xanthorrhina (Big.), p. 86 
8. Faciale low, rounded, and setose only at vibrissae......... 9 
Faciale high, sharp, and setose to middle .............. 
EET ere Huascaromusca facialis (Ald.), p. 72 
9. Legs, pleura, and base of abdomen largely orange or ° 
Dov Lee renee he PIE is. Wadd oda lite ane 10 
Legs, pleura, and base of abdomen blue green .......... 
ee em ek Huascaromusca spicata (Ald.), p. 79 
PO mOimonespreacrostichaln bristles Wee. oa. she. dle ee Bee 
Rae eS eee Huascaromusca formosa (Ald.), p. 77 
BO ME LeACl OSUICHIGPRTISULCS er. i. tt tas ok Oe oy ast oer ee ate 
Pilger itera ne ate Huascaromusca flavicrura (Ald.), p. 75 
PROMESEMBRINELLA, NEW GENUS 
Male and female. Head length at antenna greater than at 
vibrissa, causing frontal profile to appear protuberant at an- 
tennal base and the parafaciale to be considerably narrower 
below than toward lunule; faciale low and rounded; elypeus 
short and wide. Thorax with posthumeral and preacrostichal 
bristles absent. Wing low and rather narrow. Female without 
frontoorbital bristles. 
Genotype, Mesembrinella senuflava Aldrich. 
