92 



PROF. M. BEZZI. 



Apart homfuscatus, Wied., there are four described species closely related to the 

 present one, viz., bivittatus, Big., pectoralis Walk., bipartitus, Grah., and cucumarius, 

 Sack ; of these I think that the three last are only shght variations of a single species, 

 which must be called bivittatus. 



Fig. 5. Dacus armatus, F. 



In Prof. Silvestri's paper (Portici 1913 and Honolulu 1914) I am responsible for the 

 determination of the Trypaneids ; what I have identified as armatus is bivittatus, and 

 what is called bipartitus must be renamed momordicae, nom. nov. 



4. Tridacus bivittatus, Bigot, 1858, (fig. 6). 



Dacus bipartitus, Graham, 1909. 



Dacus armatus, Bezzi in Silvestri, Boll. Lab. ZooL, Portici, viii, 1913, p. 89, fig. 

 xxiii, and Div. Ent. Hawaii, Bull. 3, 1914, p. 89, pi. viii, fig. xxiii. 



This widely distributed species is easily distinguished owing to the humeral calli 

 bearing only a small yellow dot on the fore corner and by the two contiguous hypo- 

 pleural spots (fig. 6) . The brown band on the fore border of the wing seems to be 



Fig. 6. Dacus bivittatus. Big. ; an oblique 



posterior view of the thorax, to show the 



contiguous yellow hypopleural spots. 



variable, usually filhng only one-third of the breadth of the first posterior cell, but 

 sometimes filling the whole cell, being extended to the fourth vein (var. pectoralis. 

 Walker), only leaving hyahne the outer-angle. D. cucumarius. Sack, seems to be the 

 same as pectoralis, for the figure of the wing given by its author is not correct, according 

 to Dr. Speiser. The species is very destructive to cultivated Cucurbitaceae. 



