10 Orthorrhapha brachycera. 



Tlie exterior genitalia are very unsyrametrical ; in femoratus they 

 consist of a somewhat arched plate, lying to the left ; this plate bears 

 at tlie end a small, stalked plate which is directed somewhat upwards 

 and deeply cleft in a fork-shaped way, and also unsymmetrical ; 

 opposite to (above) this arched plate lie two pieces forming a kind 

 of foi'ceps. These pieces are swollen and bear some styles at the 

 end, but they are likewise unsymmetrical, one somewhat differently 

 shaped than the other; between these forceps-shaped pieces an elon- 

 gated opening is left, and at the base of this opening lie two very 

 small, hairy, styliform lamellæ which are somewhat connected in the 

 middle. In the interior lies a brown piece (the penis?). As said 

 the arched plate is always turned to the left and the forceps to the 

 right; I have not been able to decide with certainty which part of 

 the apparatus is the upper and which the lower, but I think the 

 arched plate is in reality ventral and the forceps dorsal. Strobl says 

 (Mitth. Ver. Steierm. 1892, 45) that there is a fork-shaped, stalked, 

 small lamella and above this two small, curved styli, and from this 

 description it can be seen, that he also takes the arched plate to be 

 ventral and the forceps-shaped pieces to be dorsal. In culiciformis 

 we find the same pieces lying in the same way, but the arched plate 

 has no fork-shaped process, but is itself deeply but unsymmetrically 

 incised in the end; the forceps-shaped pieces are here very thick and 

 swollen and otherwise somewhat different from those in femoratus. 

 In grossipes w^e met with the same apparatus, the arched plate like- 

 wise unsymmetrically cleft at the end ; the whole apparatus is here 

 small and not swollen , and it is generally less turned than in the 

 other species, thus confirming the view, that the arched plate is ven- 

 tral. — I do not venture to homologise this curious, unsymmetrical 

 apparatus with the exterior genitalia in Einpis, Bhamphomyia and 

 other genera in which they are symmetricai and consist of two 

 pairs of lamellæ and a small ventral plate; should they be homo- 

 logous I think hat the large, arched plate should correspond to 

 the ventral plate, the forceps-like pieces to the lower lamellæ, and 

 the styliform lamellæ to the upper ones. — In the female the eighth 

 segment is small or hidden , and at the apex there are two small , 

 styliform lamellæ. Of the legs the hind pair is somewhat elongated 

 and the femora somewhat thickened and with rows of spines beneath; 

 in some species the males have the hind femora strongly thickened. 

 The legs are otherwise more or less densely clothed with hairs and 

 have some strenger bristles; the anterior tibiæ have, generally long, 

 apical spurs, the hind tibiæ none. In some species the males have 

 very long hairs on the anterior tibiæ and tarsi. There are two claws. 



