12 R. OSTEN SACKEN 



tennal scapus; a stronger bristle, inserted more obliquely; a 

 similar one above it; a strong, erect bristle, still higher, in 

 front of the ocelli ; between the three last bristles , some weaker 

 ones are inserted ; the ocellar pair of bristles is exceedingly mi- 

 nute ; four erect bristles on the vertical edge rather weak , 

 especially the intermediate pair (postvertical pair?). 



Antennae. Scapus small, third joint long and narrow, with 

 parallel sides (the length is 5 or 6 times the breadth); arista 

 about 2 ^2 times the length of the third joint , somewhat swol- 

 len at the base, glabrous (a strong lens shows a microscopic 

 pubescence which disappears towards the tip). 



Proboscis with rather small lips; paljii linear, long. 



Thorax short and square ; macrochaetae of moderate strength 

 and not numerous; four dorso-central rows, the outer ones of 

 five bristles each; two intrahumeral bristles, one humeral; all 

 these are inserted among smaller hairs ; about five mesopleural ; 

 two sternopleural , the posterior one very long; a tuft of hypo- 

 pleural bristles. 



Scutellum as long as it is broad , with six long macrochaetae, 

 a much weaker pair of bristles on the apex. 



■Abdomefi tapering from base to tip, narrow; 2.'' and 3.'^ seg- 

 ments of nearly equal length, longer than the first; the fourth 

 has a conical base, prolonged in a slender, very slightly tape- 

 ring tail , nearly as long as segments 2.^ and 3.^ taken toge- 

 ther, and ending in a blunt point. On the underside, at the 

 base of the 4.*'' segment, there is a slit, within which the ge- 

 nitals are visible (I hold the specimen for a male); this slit 

 extends some little distance on the underside of the tail ; but 

 beyond this the slit in not visible,' although I believe that it 

 extends to the very end of the tail ; the latter appears like a 

 closed, cylindrical tube of the same chitinous covering as the 

 remainder of the body (not thicker^ or « horny » , like the ovi- 

 positors of some files); the outer surface of the tail is uneven, 

 and beset with scattered bristles , a few of them forming a 

 tuft at the tip. 



