200 



rSYCHODID.I. 



elongate, cylindrical, pubescent, of four obvious elongate joints. * 

 Antennae long and slender, 16-jointed; scapal joints short and 

 thick, the 2nd more or less spheroidal ; flagellar joints much 

 thinner and longer, the 1st usually much longer than any of the 

 others, which diminish gradually in length to the tip ; all the 

 flagellar joints distinctly verticillate. In at least some species 

 there is on each joint a i)air of small distinctly geniculated spines 

 just before the middle.t Eyes oval, more or less emarginate, 

 separated in both sexes by a broad frons. Ocelli absent. Thorax 

 much arched, densely pubescent ; scutellum small ; metanotum 

 rather well developed. Abdomen elongate, linear, narrow, eight- 

 jointed, thickly haired. Genitalia of male consisting of three pairs 



Fig. 2G. — I'lilehotomus papaiafii, Scop. $. 



of clasping appendages, proceeding from two lateral common 

 stems: oi" they iiu'y be described as forming a single pair of three 

 (vertically) branched claspers, working horizontally. The upper 

 pair is two-jointed, the first joint the longer and larger one; the 

 second joint generally, hut not always, pointed at the distal end, 

 but always bearing some stout cha)ta) ; the intermediate pair are 



* Some authors liave claimed tiiat tliere ;ire five joints to tlie palj)i, tlie first 

 Tery small, but until the question is placed beyond doubt it is preferable to 

 regard the first section as a basal cone, or in some cases as a constriction of the 

 first true joint. In Newstead's drawint; of the palpi of P. miimtus, Ilond., a 

 small first joint, making five in all, is clearlj' shown. 



t Probablj' Grassi relcrs to these in his "here and there one can observe a 

 short hair curved and relatively thick," without recognising their true nature. 



