DESCRIPTION OF THE SPECIES. 231 



tiguous spots. In speaking of T. consobrina, I have adverted to the dif- 

 ference between the males of the two species, which otherwise are closely 

 alike. The female of this species cannot easily be mistaken for that of 

 T. consobrina or any other of the species described here. 



Hab. Brazil. 



The great importance which the comparative length of the ovipositor 

 has for determination of the closely resembling species of the present group, 

 induces me to give here the following figures representing the average of 

 several measurements. The relation of the length ot the ovipositor to 

 that of the rest of the body is in pseudoparallela 1:2.6; in paraUela 

 1 : 1.8 — 1.9 ; in hamata 1 : 1.5 ; in consobrina 1 : 1.2 ; in Integra 1:1.1. Their 

 relation to the length of the wing is in pseud opar all ela 1 : 2.8 ; in parallela 

 1 : 2.1 ; in hamata 1 : 1.6 ; in consobrina 1 : 1.4 ; in integra 1 : 1.2. 



Trypeta Ocresia Walker (List, etc., IV, p. 1016), from 

 Jamaica, is an Acrotoxa, closely allied to the species described 

 by me. Whether Trypeta Acidusa Walker (ibid., p. 1014) from 

 Jamaica likewise belongs here is uncertain, as the author does not 

 state whether the end of the third longitudinal vein is directed 

 forwards or backwards ; moreover there is no statement whatever 

 concerning the shape of the scutellum and the number" of its 

 bristles. If this species is an Acrotoxa, it cannot possibly be 

 identified with any of those described above, on account of the 

 differences in the coloring. The same applies, in a greater 

 measure still, to Trypeta serpentina Wiedemann, already alluded 

 to above. 



In order to bring together whatever I know concerning the 

 Trypetse belonging to the group Acrotoxa, I give on Tab. XI, f. 

 26, a copy of the figure of the wing of Trypeta grandis Macq. 

 (Dipt. Exot. Suppl., I, p. 212. Tab. XVIII, f. 14), from New 

 Granada, and on Tab. XI, f. 21, that of the wing of Vrophora 

 bivittata Macq. (Dipt. Exot., II, 3, p. 222. Tab. XXX, f. 1), 

 of unknown habitat. Both wings show an outline somewhat 

 different from the other Acrotoxse, more oblique transverse veins, 

 a more narrow first posterior cell, a weaker forward turn of the 

 third vein, etc. I am inclined to believe that these differences 

 do not, for the most part, exist in reality, but are only due to the 

 usual inaccuracy in Macquart's figures; and for this reason I 

 believe that both T. grandis Macq. and Urophora bivittata Macq. 

 are Acrotox.se. Should my supposition prove correct, then it 

 becomes very probable that America is the habitat of the latter 

 species. 



