1- 1^1^ 



429. 

 HELOPHILUS RUDDII. 



Order Diptera. Fam. Syrpliidae. 



Type of the Genus, Musca pendula Linn. 



HELOPniLUS Meig., Lat., Curt. — Eristalis, Syrphus and Rhingia 

 Fab. and Panz. — Musca Linn. 



Antennae inserted on a protuberance at the top of the face, por- 

 rected, small, contiguous, and 5 -jointed ; basal joint subconic 

 and pilose, 2nd broad pilose and cup-shaped, 3rd very large and 

 ovate, and at the top towards the base is attached the 4th joint 

 which is very minute, the 5th forming a long and slightly pu- 

 bescent seta (3). 



Labrum rather long stout and hollow, divided into 5 narrow 

 lobes at the apex (I, ft). Tongue nearly as long as tlie labrum, 

 lanceolate and acute, with a rib down the centre (c). Maxillcs 

 shorter than the tongue, sublanceolate and curved (e). Palpi 

 attached to the maxillae, rather shorter, linear, obtuse and slightly 

 hairy (f). Lip long and large, horny at the base, terminated by 

 2 large, submembranous hairy lobes (g). 

 Trophi received into a cavity at the bottom of the face. Head trans- 

 verse, hemispherical, lower part of the face gibbose (2), sometimes 

 projecting in a beak (2*). Eyes naked, remote in both sexes, but 

 less so in the males. Ocelli 3 in triangle. Thorax subquadrate-glo- 

 bose: scateWum transverse semioval. Abdomen linear or broad and 

 conical. Wings divaricating (9). Halteres small and capitate. 

 Thighs } posterior large and thickly set with spiny bristles beneath, 

 towards the apex. Tibiae ; atiterior short, posterior curved. Tarsi 

 5-jointed, basal joint the longest, 4th somewhat crescent-shaped, 5th 

 obconic. Claws and Pulvilli distinct (8 fj hind leg). 

 Larvae joith a long slender tail and living in the water. 



RuDDii Curtis MSS. — Guide, Gen. 1245. 



Black rather shining, clothed with ochreous pubescence. Head 

 dull ochreous. Face silvery gray, dark in the centre, as well as 

 round the antennae, the crown piceous ; eyes castaneous-black. 

 Thorax ochreous above with 3 blueish black stripes down the back : 

 scutellum black, ferruginous at the apex. Abdomen black with 

 a chalybeous tinge above, the 2nd, 3rd and 4th segments with a 

 kidney-shaped ochreous spot on each side the middle, and an in- 

 terrupted line of the same colour down the sides ; basal joint, 

 margins of the segments and apex dark cinereous. Wings 

 slightly tinged with tuscous. Legs with the tips of the thighs 

 ferruginous, middle and posterior tibiae slightly ferruginous at 

 the base, with a ring of the same colour round the middle. 



In the Cabinets of Mr. Rudd and the Author. 



Helophilus is one of several groups that are distinguished 

 by the 4th longitudinal nervure having an open loop; iVom 



