24 Orthonhapha brachycera. 



they are relatively short, of the same shape in both sexes. They are 

 five-jointed, the two basal joints obconical, the third short ovate, almost 

 roundish, compressed, bearing dorsally a long, two-jointed arista, the 

 basal joint of which is short. The arista may in foreign species be 

 dilated at the end in the males, and it may sometimes be very long. 

 The first antennal joint has no hairs above, the second bears a circlet 

 of small bristles at the apex, the uppermost is the longest; the third 

 joint and the arista are densely short-haired. Epistoma is, as said, 

 generally rather broad, and of the same or almost the same breadth 

 in both sexes, sometimes narrower, and narrower in the male 

 than in the female. Clypeus is only slightly marked by a small 

 notch at each side; it reaches to, or almost to the lower margin 

 of the eyes. Proboscis slightly protruding; it is of the same or 

 almost the same size in both sexes, only when the epistoma is nar- 

 row in the male, the proboscis is here a little more slender than in 

 the female. Labrum very strong; it has a median, less chitinised, 

 and two lateral, strongly chitinised teeth; on account of its semi- 

 tubular shape the lateral teeth are lying lower than the median. 

 Hypopharynx strong, triangular, about of the length of labrum. 

 The maxillary palpi are oval, squamiform. Labium has the basal 

 part and the labella of about the same length. Thorax somewhat 

 high, rectangular or almost quadratic; prothorax very small, with 

 small bristles above; metathorax likewise small, and there is no chi- 

 tinised metasternum. The acrostichal bristles biserial, very small 

 or a little longer; there are six dorsocentral bristles, increasing in 

 length behind, further a humeral, a posthumeral, two notopleural, a 

 præsutural, two or three supraalar and a postalar bristle; besides 

 there are some small hairs on the anterior part of thorax; prothor- 

 acic bristles are only represented by a few rather small, more or 

 less bristly hairs. Scutellum bare above with two marginal bristles 

 and on each side a small hair. Abdomen long and slender; the 

 first dorsal segment is very short and a little broader than the fol- 

 lowing; the first ventral segment is likewise short, and weakly chiti- 

 nised; in the male there are six visible segments, except the first of 

 about the same length; the seventh is small and somewhat hidden. 

 The hypopygium is exposed, rather small; in some species it is 

 typical, with two outer lamellæ, in others the outer lamellæ are 

 united, and there are long, styliform or almost thread-like posterior 

 ventral lobes. In the female the abdomen is less long and slender; it 

 has five visible segments; the small ovipositor ends with some (4) 

 small spines above, and a pair of small styli below. There are no 

 dot-like impressions at the side margins of the dorsal segments. 



1 



