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513. 

 HELEODROMIA BISTIGMA. 



Order Diptera. Fam. Tachydromidae. 



Type of the Genus, H. immaculata Hal. 

 Heleodromia Hal. — Brachystoma and Gloma Curt. 



AntenncE inserted between the eyes, near the middle of the face, 

 small porrected pubescent and 5-jointed, 3 basal joints stout, 

 1st subobtrigonate, 2nd cup-shaped, 3rd pear-shaped, being at- 

 tenuated at the apex to which is attached the 4th joint, which 

 is very minute, 5th long and filiform (3). 

 Labriim ? transverse, and very broad at the apex (1, b). 

 Tongue broad and lanceolate, with an obtuse tooth on the upper 

 side at the base (c). 

 Palpi large clavate and pilose (f). 

 Lip short thick bilobed pubescent and pilose (g). 

 Head small nutant, globose above, the face elongated and attenuated 

 (2 * front view) ; neck distinct : clypeus apparently divided : eyes 

 remote in both sexes, not very large, lateral and ovate : ocelli 3 in 

 triangle on the crown of the head (2 profile) : Thorax elongate 

 ovate : scutellum semiorbicular. Abdomen rather short, conical 

 at the apex, terminated by a conical compressed process in the male 

 and by 2 small lobes in the female. Wings long and narrow, in- 

 cumbent and parallel in repose, generally with the 4th longitudinal 

 nervure furcate at the apex, an elongated, perfect discoidal cell, with 

 2 small ones at the base, and emitting 3 nervures to the margin : 

 halteres clavate. Legs long and slender : coxae, anterior large : 

 Thighs and tibiae simple : tarsi long and 5-jointed, basal joint long, 

 4th small : claws and pulvilli simple but distinct (8 fore leg). 

 Obs. The description and dissections are from the species figured. 



BiSTiGMA Curt. Guide, Gen. 1206. 2. 



Opake slate-colour pale blueish beneath, slightly pubescent : 

 eyes and antennae black, back of thorax and sometimes of the 

 abdomen, ochreous brown : wings pale fuscous, base and hal- 

 teres pale ochreous ; nervures and a round spot close to the 

 costa beyond the middle piceous, the nervure being a little 

 bowed to inclose it. Obs. Sometimes the spot on the wing is 

 very faint. 



In the Cabinets of Mr. Rudd and the Author. 



At the time the Guide was published I found much difficulty 

 in locating the insect figured, of which I had only one injured 

 specimen, and as the antennae appeared to agree better with 

 those of Gloma than Brachystoma, I included it in that genus. 

 Mr. Haliday has since formed it and some others into the 

 genus Heleodromia, and as I possess an undescribed species, 

 I shall give short characters of the whole, which he thus 

 divides. 



