368 ME. WALTEE •WESCHE ON THE GENITALIA OF 



many short spines and blunt bristles ; both apodemes are easily made out in Sicus 

 ferrugineus (Linn.) and Ilyopa buccata (Linn.). 



(Estriclce. — The male of Oastrophihis equi, Fabr., has large horny forcipes, like those 

 of the Conopidae, more valvular than hamate, but without spinous processes ; the 

 ajipendages are large, but I have only very poor preparations of both sexes, and cannot 

 make out either of the apodemes. The female has hairy valves which enclose a curious 

 chitinous chamber in the vagina, and I can only make out two receptacula; but 

 obviously this insect requires more study from fresh preparations before anything more 

 definite can be said. 



Fhycodromidce. — The genitalia of the Phycodromidse are distinctly Muscid in type, 

 but have a long ribbon-like process at the extremity. A species of Ccelopa has on the 

 end of the penis five triangular membranous a2:)pendages ; from the central triangle, 

 which is flanked on either side by a pair of the others, the ribbon is attached ; a long 

 central apodeme is easily made out. The ovipositor is much longer than that found in the 

 Cordyluridae, but not so long as in Mnsca clomestica, and has the usual three receptacula. 



SeteroneuridcB. — I have no preparations of the small Heteroneura family in my 

 collection. 



SciomyzidcB. — In the Sciomyzidse the genitalia are of the Muscid type in most species. 

 Sciomyza cinerella. Fall., has both levers very much developed, and the female appears 

 to have only two receptacula, but these are remarkably horny, covered Avitli short 

 barbs and with strongly chitinized stalks. The ovipositor is short, with hairy valves 

 and two apodemes at the base of the penultimate segment. 



FsilidfB. — The males of Loxocera albiseta (Schrank) have small genitalia of a rather 

 indefinite character, and possibly other species of this group may give better results. 



MicropezidcB and Fiophilidce. — In the Micropezidse, also, I have had insufiicient 

 material, and even less in the minute Piophilidae. 



Brosophilidce. — The male of Drosophila fimehris (Fabr.) has most elaborately hamate 

 genitalia of a decided Muscid type ; the female has a short ovipositor not capable of 

 extrusion and only two receptacula (so far as a single sjDccimen is to be relied on). 



Chloropidce. — The males in the Chloropidse have apodemes of the Muscid type, and 

 the females long membranous ovipositors, which consist of three segments, and have 

 a characteristic longitudinal striation. The receptacula are not chitinous, as none 

 appear in my preparations that have been cleared in caustic potash. 



Milichiid(P, Agromyzidce, Asteiidce. — I have no preparations of these families in my 

 collection. 



Fhoridce.- — In some males of the Phoridse there are suggestions of a petiolated hypo- 

 pygium like that in the Dolichopodidae, but the genitalia are peculiar and not easy to 

 classify. The females of some species have an ovipositor which is remarkably like that 

 of the Chloropidse, and which also does not show any receptacula. 



HijipoboscidcB. — In the Hippoboscidae the penis appears to consist of several stiles, 

 as in the Stratiomyiidse. In Ilelophagus ovimts (Linn.) the double levers are evident, 

 suggesting a Tabanid descent; the female has, however, the two pairs of paired spiracles 

 which we find in some Muscidse. 



