Leptididae. 153 



Yowls not produced below tlie eyes, horizontal. Antennæ three- 

 jointed, the basal joint sonietimes large and thickened, the second 

 small, the third produced downwards, somewhat reniforni, with an 

 arista going out from the upper part of the front edge. Eyes bare, 

 the upper facets in the male larger than the lover, the dividing line 

 nioderately sharp. With regard to the mouth parts I have only been 

 able to exaniine the male, and for the female I must depend on 

 Becher's description; as in Atherix the mouth parts are difterent in 

 the two sexes, the female being in possession of mandibies. The 

 proboscis is not long, the basal part of labium short, the labella longer 

 than the basal part, moderately broad, 

 somewhat protruding; the labrum is 

 nearly as long as the proboscis, the 

 maxillæ of a similar lengtli, pointed, 

 somewhat semitubular; in the females 

 the mandibies are rather strong chiti- 

 nous blades ; the hypopharynx is slender 

 but as long as the labrum. As men- Fig. 45. Antenna of 



tioned under Atherix Becher says that ^- cmssicomis. 



the males of Atherix and Sijmphoromyia seeui to want the hypo- 

 pharynx; this is incorrect, at all events with regard to the present 

 genus, then I found a hypopharynx in the male that was easily seen 

 but slender, and with a distinct salivary duet. I therefore think it 

 certain that a hypopharynx is also present in Atherix; according to 

 Becher this genus has a short hypopharynx in the female, perhaps 

 then this organ in the male is short and slender and easily escapes 

 observation: it is very iniprobable that the hypopharynx should be 

 quite absent. The maxillary palpi are distinctly two-jointed, the basal 

 joint fully half as long as the apical, this is slightly curved and densely 

 clothed with long and strong hairs. Thorax is nearly quadratic. 

 Abdomen is somewhat elongated, consisting of seven segments. The 

 male genitalia are somewhat swoilen, with thick lateral appendages, 

 in the female the abdomen terminates in an ovipositor with two small 

 lamellæ. The front tibiæ have no apical spurs, the middle tibiæ have 

 two and the hind tibiæ one apical spur; the front tarsi without longer 

 hairs. Wings with the anal cell narrowly open. 



The larva of S. crassicornis is described by Beling (Arch. fiir 

 Naturgesch. Jahrg. 48, 18S2. 19o). It is cylindrical, somewhat fusiform, 

 dirty white. The body consists of twelve segments; the last segment 

 terminates in two open, horizontal lips, the upper lip has four small 

 teeth, the lower has also four teeth but very small. On the inner side 

 the lips are brown; between the lips lie the terminal spiracles; the larva 



