120 C. R. Osten Sacken: Diptera from the PhUippine Islands. 



from side to side, but attenuated at both sides, so as to leave the an- 

 terior corners of the segment black; it is subinterrupted in the middle; 

 a similar crossband on the third segment is much less distinct (in one 

 of the specimens only its ends are visible, the middle remaining black); 

 the sides of the third segment are brownish -yellow, but this color is 

 partly concealed under a dense, short golden-yellow pubescence; a black 

 triangle occupies the middle and end of the segment. The abdomen 

 is very gibbous and the fourth segment is nearly as long as it is 

 broad, almost circular in shape. Wings unicolorous, with a yellowish 

 tinge; stigma of a more saturate yellow. — Two specimens. 



NB. Allied to G. ventralis Wied. (II, 207, .Java), which however 

 has three black stripes on the rostriform epistoma, altogether black 

 tibiae, a differently colored abdomen etc. 



O. tibialis Wk. J. Pr. Lin. Soc III, 95 and IV, 118 (Celebes) 

 also seems to belong in this group, but has a black line on the ros- 

 trum; ,, tibiae and anterior femora with black bands," The specimen 

 from Java, mentioned by me in the Enumer. etc. 51 likewise belongs 

 here, but has the femora (except at the tip) black. 



The color of the front and of the abdomen of 6r. microdon must 

 be variable; it is different even in my two specimens. The gibbous 

 abdomen and the shape of its fourth segment remined one of Microdon. 



Q-raptomyza spec; one specimen. Must ve&emhle G. ventralis 

 Wied. II, 207 (Java) very much, especially in the characteristic yellow 

 stripes, parallel to the lateral abdominal margin, on each side; but the 

 proximal half of the femora is black, the tarsi altogether black; the 

 rostriform epistoma has only a very weak median brown stripe and no 

 perceptible gibbosity; the median yellow stripe on the abdomen is 

 wanting etc. As it is evident that the species of this group are variable 

 in their coloring, it is necessary to ascertain the possible limits of this 

 variation, before describing many new species. 



(Fortsetzung im nachsten Heft.) 



