20 E. B. Williamson 



margins of genital fossa without spines or teeth, a small patch of short 

 bristles on the marginal prominence opposite the posterior end of the ligula)/ 

 on 3 AL triangular, reaching about half the distance to the transverse carina ; 

 3-7 each with MD small, triangular, narrowly separated, and PD small and 

 elliptical, both MD and PD progressively smaller posteriorly, almost gone 

 on 7, on 8 MD represented by mere dots; ML and PL apparently wanting 

 or very faint on 3 and posterior to that segment ; AL on 4 and posteriorly 

 inconspicuous or wanting. 



(Wings hyaline, costa dark reddish brown to black, stigma dark brown, 

 ventral surface paler and yellowish; venation black or nearly so.) 



(First femora black, green behind the full length except the extreme 

 apex, first tibiae and tarsi dark brown ; middle and hind legs similar in 

 color, femora and tibiae light to dark reddish brown, each femur paler 

 toward the base and black at apex, each tibia dark to black at base and 

 apex, tarsi black or nearly so.) 



Female. — Based entirely on preserved material. Face yellowish brown, 

 yellower below, darker and obscurer above with only faint tinges of green. 

 Head above similar to the male. 



Thorax similar to the male, the middorsal dark area more nearly tri- 

 angular in shape, the dark colors reddish brown, paler, and the green less 

 vivid. 



Abdomen, like the thorax, paler than in the male, only the apical three 

 or four segments apparently black or much darker than the paler basal 

 segments. D and L present on i, the latter large; 2 with AML, MD and 

 PL joined into a long wide longitudinal bar just above the lateral carina; 

 on 3 AL and ML joined, and the other spots. MD, PD and PL, present; 

 4 with the five spots, AL, ML, MD, PD and PL all present, though small; 

 these spots can all be detected on 5 and 6, and in life doubtless some of them 

 are continued farther posteriorly. Appendages regularly elliptical, widest 

 about the middle, maximum width .9-1.0, a low median longitudinal dorsal 

 carina, apex regularly rounded, extreme apex acute. 



Wings and legs as in the male. 



Of fourteen wings of males, twelve had two cells in the most anterior 

 row in the anal loop, and two wings had three cells ; of fourteen wings of 

 females nine had two cells and five had three cells. In the males there were 

 invariably two cells just posterior to A between the anal loop and the anal 

 •triangle; and in the females there were in every case four cells posterior 

 to A from wing base to anal loop. Of both sexes twenty-three front wings 

 had a single row of cells throughout between M, and Rs, three wings had 

 a single double cell, and two wings had two-three double cells; in the twenty- 

 eight hind wings all had a single row of cells between M^ and Rs. 



Ditsleri is the smallest and possibly the handsomest of the trifida group, 

 and the smallest specimens are smaller than the smallest septima I have seen. 

 However, the male from Blumenau, referred to this species, is larger than the 

 measurements given above, the abdomen being 42.5 and the hind wing 40. 

 The wings are slightly tinged brownish ; there are two cells in the anterior 



