76 



Syi'phidae. 



the basal part and has very short basal joints. The two basal 

 antennal joints a little hairy. the third and the arista microscopically 

 hairy. Epistoma a little letreating, without any proniinence, slightly 

 arched, not or almost not reflexed at the moulh edge; it is black, 

 longish hairy; jowls slightly descending, with a pit in front. Glypeus 

 horse-shoe-shaped ; the mouth parts chiefly as in Pipizella ; labrum 

 strong and somewhat high, semitubular and with the apex as in 

 Pipizella; maxillæ and palpi short, the latter club-shaped; hypopharynx 

 strong, also semitubular, the cavity upwards, it is more pointed than 



Abdomen of F. noctiluca. 

 Fig. 25. Male, the apical knob Fig. 26. 



is the eighth segment. _ Female. 



in Fipizella, but the extreme point rounded. Labium with the chitinised 

 basal part and the broad labella about equal in length. Thorax nearly 

 quadratic, somewhat densely hairy; scutellum black, with marginal 

 hairs below. No bristles present ; metapleura with short hairs. Abdomen 

 elongate, flat, more or less ovate, on the broadest part broader than 

 thorax, but somewhat varying in breadth in the various species, and 

 often most ovate in the female; the segments have a more or less 

 pronounced, somewhat arched elevation at each side, most distinct on 

 third and fourth segments. On the ventral side there is a small 

 chitinisation at the base, otherwise the basal ventral segments are 

 weakly chitinised. In the male the abdomen shows tour not trans- 

 formed segments; the genitalia shaped mainly as in Pipizella, the 

 ninth segment with its appendages not large. In the female abdomen 



