Genus Stethomyia. 59 



the second posterior longer than the cell ; mid cross-vein just a 

 little posterior to the supernumerary, the posterior about its own 

 length distant from the mid ; scales large, bluntly lanceolate to 

 almost spindle shaped. 



Halteres pale ochreous. 



Length — 4 * 8 to 5 mm. 



Habitat. — Mount Aureol, Sierra Leone (Captain Grattan). 



Time of capture. — February (21. 04). 



Observations. — Described from three $ 's. One bears a note 

 " taken in bush." It is very marked, the golden-yellow banded 

 palpi and quaint genitalia at once separate it. 



One specimen shows the third border spot reaching the upper 

 edge of costa, the others do not. 



Genus STETHOMYIA. Theobald. 



Journ. Trop. Med. V., p. 181 (1902); Mono. Culicid. III., p. 62 (1903); 

 Genera Insect (Fam. Culicid.), p. 8 (1905). 



This genus now contains four species. The character given 

 previously of the mammillated prothoracic lobes is not of any 

 diagnostic value as it is seen in other genera. 



The main character separating the genus from other Ano- 

 pheline genera is the presence of flat scales on the middle line of 

 the head and the very thin upright forked scales. 



Three of the four species are Asiatic, the fourth South 

 American. 



They tabulate as follows : — 



A. Thorax with a silvery median and lateral lines. 



Black species nimba. Theobald. 



B. Thorax unadorned. 



Thorax with long, irregular, deep brown hairs gracilis. Theobald. 



Thorax with a few white hair-like scales culiciformis. James 



and List on. 

 Thorax with hair-like brown curved scales and 



frosty-grey tomentum pallida. Ludlow. 



Group B has the cephalic scales not quite so flat as in A, and 

 may possibly form a distinct genus. 



