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568. 

 RHAPHIUM MACROCERUM. 



Order Diptera. Fam. Dolichopidae. 



Type of the Genus, Rhaphium macrocerum Wied. 

 Rhaphium Meig., Curt. 



Antennce inserted above the middle of the face, contiguous, long-, 

 porrected, stout, sublanceolate and 5-jointed in the males (3 (J), 

 basal joint obtrigonate, 2nd small transverse cup-shaped, pro- 

 ducing a few bristles, 3rd very long, pubescent, sublanceolate, 

 ^ compressed, sometimes truncated obliquely at the apex, where 

 the 4th joint is attached, which is pubescent, very short and 

 slender, 5th twice as long ; 3rd joint short and ovate in the 

 female (9), the 5th forming a long pubescent seta. 

 Trophi short. 



Labrum broad hollow, pointed and notched (1, b). 

 Tongue shorter than the labrum, curved and pointed (c) . 

 Mandibles and Maxillce none. 



Palpi thin, dilated and somewhat spoon-shaped (f). 

 Lip short pilose, formed of 2 lobes (g). 

 Head transverse ovate ; face suborbicular in the male (2 (^), more tri- 

 gonate-ovate in the female ( ?): eyes large lateral and ovate, ap- 

 proaching more on the face in the ^ than female : ocelli 3 in triangle, 

 elevated on the crown of the head. Thorax oblong : scutellum se- 

 miorbicular. Abdomen short, slightly attenuated, 6-jointed, the 

 apex incurved in the male and producing 2 long ciliated lobes, with 

 2 shorter ones in the centre, terminated by 2 brushes of long curved 

 hairs (7). Wings incumbent and parallel, iridescent, 4th longitudinal 

 ^ nervure slightly curved towards the apex, with a transverse nervure 

 uniting it and the 5th : halteres short and capitate. Legs rather 

 long especially the hinder pair: thighs, posterior thickened: tibise 

 simple, with spiny bristles outside and at the apex: tarsi tapering, 

 5-jointed, basal joint the longest, except in the hinder pair, in which 

 the '2nd is the longest (S, afore leg). 



Macrocerum Wied., Meig. — Curt. Guide, Gen. 1251. 2. 



Aureous-green clothed with black bristles : forehead blue and 

 violet ; hypostoma silvery grey ; antennae velvety piceous, 3rd 

 joint very long in the male (3 (J ), ovate in the female ( ? ) ; thorax 

 dull green, sometimes with 2 or more strijies on the fore part, 

 the shoulders silvery grey: abdomen pubescent: wings pale 

 fuscous, the costa and nervures darker : halteres yellow : legs 

 ochreous, bristles black, hinder thighs with the tips and a stripe 

 down the back piceous ; tarsi and hinder tibiae, in the males, 

 piceous. 



In the Author's and other Cabinets. 



The typical Rhaphii are at once distinguished from Porphy- 

 rops (I'ol. 54-1 .) by the great length of the masculine antennae : 

 Meigen, however, has expressed an opinion in his last volume 



