689. 

 TRIGONOMETOPUS FRONTALIS. 



Order Diptera. Fam. Muscidae. 



Type of the Genus, Tetanocera frontalis Meig. 

 Trigonometopus Macq., Curt. — Tetanocera Meig. 



AnterincE attached to the apex of the forehead, approximating-, 

 porrected, short, 5 -jointed, basal joint obconic, 2nd a little larger 

 and cup-shaped, both margined with very strong bristles, 3rd the 

 largest, pubescent, compressed, ovate-conic, the apex acute, 

 4th a small oval joint, attached near the back, a little before the 

 middle, 5th a long pubescent seta (3). 



Labrum broad, the centre produced, forming an elongated spine 

 i\b). 



Tongue shorter, slender and acute (e). 



Maxilla very short obtuse (e). Palpi longer than the labrum, 

 stout, linear, curved, bristly outside {f). 



Lip large in proportion, exserted, inserted in a cavity at the 

 bottom of the face, formhig 2 large fleshy lobes closely united 

 and slightly bristly outside {g). 

 Head elongate-trigonate, truncated before, concave behind ; crown flat 

 but grooved ; face inclining imvard very obliquely (2 the profile), 

 straight with a few long bristles on the sides : eyes very remote, 

 lateral ovate and not prominent : ocelli very minute, 3 in triangle at 

 the base of the head (2* underside of head). Thorax oblong : scutel 

 trig onate -ovate. Abdomen depressed, short, ovate and 6-jointed. 

 Wings very ample, costa convex, slightly pubescent with short mar- 

 ginal and 4 longitudinal nervures, 2nd and 3rd united by transverse 

 nervure before, and the 3rd and 4th by one beyond the middle ; hal- 

 teres short and capitate. Legs moderate : thighs, anterior with a 

 series of long bristles beneath: tibiae, intermediate with a few spiny 

 bristles at the apex, hinder with 1 outside : tarsi as long as the tibiae, 

 and 5 -jointed, basal joint elongated, 3 terminal short : claws and 

 pulvilli small. 



Frontalis Meig. 6. 44. 20.— Curt. Gen. 1326''. 



Ochreous with scattered black bristles and hairs ; antennae fer- 

 ruginous, seta fuscous ; eyes blackish ; head with a broad de- 

 pressed stripe down the middle : thorax with 4 feiTuginous 

 stripes, lateral the broadest ; margin of scutel whitish : abdo- 

 men with 2 large livid spots at the base of each segment : wings 

 pale yellow, darkest at the costa, nervures light brown, partially 

 darker, with fuscous spots on the 2 transverse nervures, and 1 

 or 2 others towards the apex of the 3rd longitudinal nervure, 

 where there are as many rudimentary nervures. 



In the Cabinets of Mr. Dale and the Author. 



I This species, which at first sight might be taken for a Dorj/- 

 cara, is readily distinguished on a closer examination, by the 



