322 ^^6 Philippine Journal of Science i9i» 



64. Chaetodacus ferrugineus Fabr. var. pedestris nov. 



Mesonotum, pleurae, and metanotum intensely black, with the 

 typical yellow streaks and spots ; the brown spots on the f rons 

 very well marked, including a central large round dot. Tibiae 

 dark brown, the posterior ones black ; all the femora with a broad 

 black ring before the apex most strongly developed on the fore 

 pair, on the middle and hind pairs distinct at least on the under- 

 side. Costal border, of the wings broader and darker. 



Length of body, 6 to 8 mm. 



This form of the variable species is closely allied to C. dorsalis 

 Hendel from Formosa (which may be a form of C. ferrugineus) , 

 but is at once distinguished by the color of the legs. The typical 

 Indian form has the legs more yellow; var. obscuratus Meij. has 

 no yellow lateral stripes on the dorsum; C. cilifer Hendel has 

 the yellow lines, but shows a wholly black abdomen. — 



Genus MONACROSTICHITS novum 



According to my paper on Indian trypaneids, true species of 

 Dacus are wanting in the Oriental Region, where are to be found 

 only species of Bactrocera and Chaetodacus. Professor Baker 

 has, however, sent to me what is in certain characters a true 

 Dacus, but it has no anterior supra-alar and no prsescutellar bris- 

 tles. This form shows, however, so many other unique peculiar- 

 ities, that I think it better to erect for it a new genus, the type 

 of which might perhaps be considered Dacus longicornis of 

 Wiedemann (not of Guerin-Meneville which is a Bactrocera), 

 although it is certainly well represented by the new species M. 

 citricola. It may be characterized as follows : 



Like Chsetodacus, but without anterior supra-alar and prae- 

 scutellar bristles; antennae very long and geniculate; abdomen 

 conspicuously constricted about the base, club-shaped as in 

 Conops; front femora with some spines beneath near the apex; 

 second abscissa of the fourth longitudinal vein very sinuose be- 

 fore the small cross-vein, the discoidal cell being therefore very 

 distinctly narrowed near the base. 



A particular feature of this genus (or at least of the species 

 described below), and which I have never before noted in any 

 trypaneid known to me, is the presence of a single but rather 

 strong, acrostichal bristle placed on the middle line before the 

 suture, and therefore not paired. Of 5 specimens examined, 3 

 do not have this peculiar bristle, 1 has it on the suture, and 1 

 before the suture. 



The type of the genus is Monacrostichus citricola sp. nov. 



