the Ti'pulid genus Styringomyia. 209 



small pits so commonly seen in other Limnobiinae near the anterior 

 margin is not distinctly noticeable ; there are two submedian rows 

 of small bristles in front of the suture, and a pair of large ones 

 behind the suture ; there are also three strong bristles on each side- 

 margin, extending outwards, one just in front of and two behind 

 the suture. The scutellum is separated from the main portion of 

 the mesonotum by a pair of elongate-triangvilar depressions; it 

 bears two strong bristles near the middle. The meso-epimerum 

 bears a row of three or four bristles, just below the roots of the 

 wings, and tliere is also a row of bristles on the meso-steryium. 



The Male Abdomen is of a very primitive type. The first segment 

 is a little shorter than broad; segments 2-7 all about equal in 

 length, roughly twice as long as broad; segment 8 very short, 

 but quite distinct and quite disconnected from the hypopygium, its 

 tergal and sternal plates about equal in size. The ninth segment 

 {hypopygium) consists of a tergite, two large side pieces and a 

 sternite, wliich are connected with one another only by membrane. 

 The tergite is quite a large plate, shortly pubescent in its apical 

 portion and terminating in two strong bristles. The sternite is 

 rather larger than the tergite, rounded or truncate apically, and 

 has articulated to it a weakly chitinised, various-shaped, very 

 pubescent plate, which is here regarded as representing the tenth 

 sternite. The side pieces are rather longer than the tergite or 

 sternite and are terminated by a long spine; they bear an upper 

 and a lower appendage, the upper one in nearly all the species being 

 a membranous, strap-shaped structure terminating in one long 

 bristle and one short one ; the lower one is elaborately divided up 

 and frequently carries numbers of black spines. The penis sheath 

 (adminiculum) is highly chitinised at its extremity and affords ex- 

 cellent specific characters, though it has not been possible to figure 

 it in every case. Apart from the appendage to the ninth sternite, 

 which may not have been correctly homologised, there are no 

 distinct structures representing the tenth segment. 



The Female Abdomen is shorter than that of the male, and ap- 

 parently less primitive, since the eighth and ninth segments are 

 fused and quite inseparable after boiling in potash. The ovipositor 

 is very short but extremely complicated ; I am not sufficiently sure 

 of the homologies of the different parts to give a detailed description. 

 The suture between the eighth and ninth segments is less evident 

 than in other Tipulidae, but it can sometimes be made out in the 

 dry specimens, though in microscope preparations it is less evident. 

 The sternite of the seventh segment is very much larger than the 

 tergite and serves to cover the terminal segments. I have called it 

 the operculum ; its outline varies according to the species. 



TRANS. ENT. SOC. LOND. 1914. — PART I. (JUNE) P 



