DICHAETA. 133 



other are as follows : The species of Dichcela have longer and 

 stouter bristles ; the mystacidal bristles on the side of their face there 

 are less numerous, but much longer and stouter; moreover, in the 

 males of Dicheeta the penultimate segment of the abdomen, on its 

 posterior edge, is provided with a transverse row of very long bris- 

 tles, and ou the tip of the last segment, above the anal opening, 

 there are two bristles inserted near each other and curved upwards, 

 which is never the case in Notvphila. 



Only two European species of Dicheeta were hitherto known. The 

 two species occurring in North America are identical with them. 



Synopsis of the Species. 



{ Last segment of the abdomen in the male prolonged in a conical point. 



j 1 caudata Fall. 



I Last segment of the abdomen in the male not prolonged in a conical 



point. 2 brevicauda Loeiv. 



1. I>. caudata Fall. % and £ • — Nigricans, segmento abdominal! 

 penultiino in mare setis decern elongatis armato segmentoque ultimo in 

 comirn producto. 



Blackish, the penultimate segment of the male abdomen with ten long 

 bristles, the last segment conically prolonged. Long. corp. 0.17. Long. 

 al. 0.17. 



This well known species is distinguished from the following by 

 its somewhat larger size, the greater number and the length of the 

 bristles on the posterior border of the penultimate segment of the 

 male abdomen, the conical prolongation of its last segment, and the 

 much greater length of the two stout bristles inserted on the tip 

 of this prolongation. 



Hub. Middle States. (Osten-Sacken.) 



Note. — A detailed description of this species is to be found in Meigen, 

 Zweifl. VI, p. 62.— 0. S. 



2. D. lU'evicauda Loew. % . — Nigricans, segmento abdominali pe- 

 nultiino in mare setis sex elongatis armato segmentoque ultimo breviter 

 acuminato. 



Blackish, the penultimate segment of the male abdomen with six long bris- 

 tles on the posterior border, the Last segment but little pointed. Long, 

 corp. 0.16. Long. al. 0.16. 



The differences pointed out in the description of the foregoing 

 species will be sufficient to distinguish this. The greater part of 



