264 [Berliner Entomolog. Zeitschrift Bd. XXXIX. 1894. Heft II. 



Three Trochobolae, 

 from New-Zealand and Tasmania. 



C. B. Osten Sacken. 



Trochobola Dohrni n. sp. cfQ 

 Very like the European T. annulata and the American T. argus 

 in the general appearance and the coloring, hnt more variable in size, 

 and generally larger. The wings are narrower in outline; the venation 

 is nearly the same, only the supernumerary crossvein in the anal cell 

 is more oblique, and the great crossvein is a little proximad of the 

 proximal end of the discal cell (and not a little distad, as rlgured 

 by Loew, Linn. V, Tab. II, f. 13 and 15, and Mik, Verb. Z. B. Ges. 

 1878, Tab. X, f. 7, for the European annulata). In the only female 

 which I possess, the great crossvein eoineides with the proximal end 

 of the discal cell (as represented by 0. S., Mon. N.-A. Dipt. IV, Tab. I. 

 f. 4 for T. argus). This character is generally variable, and not 

 much to be relied upon. 



The prineipal difference lies in the coloration of the wings. The 

 distribution of the ocelli is nearly the same as in annulata and 

 argus, but the proximal two thirds of the second basal cell are tilled 

 out, or nearly so, with brown; there is a large brown spot in the 

 region of the stigma, between the third vein and the costa; within 

 it there is a small yellowish spot, on the costa, a little beyond the 

 tip of the auxiliary vein, and a round hyaline spot in the proximal 

 end of the submarginal cell; along the apex, the distal end of the 

 submarginal and first posterior cell? have a dark-brown irregulär 

 margin. The coloration of the wings is somewhat variable in the 

 intensity of the brown spots and in their extent. In the only female 

 speeimen that I have, the brown that in the male fills out the two 

 proximal thirds of the second basal cell is interrupted by a hyaline 

 crossband, running across the wing. Whether this character is a 

 constant peculiarity of the female, I cannot teil. 



