130 THE CANADIAN ENTOMOLOGIST. 



Described from one very perfect specimen sent by Dr. Whitmore in 

 the collection referred to below. 



In spite of the fact that the prothoracic lobes are not mammillated, and 

 indeed seem stalked, the other characteristics point so strongly to 

 Stethomyia that I have decided to put this insect under that genus. 



Heizmannia, nov. gen. 



Head covered with broad flat scales ; thorax with flat spindle-shaped 

 scales, very broad on the lateral thirds of the mesonotum ; scutelluni with 

 broad flat scales ; metanotum with large median bunch of chaetae (not less 

 than 16-20) on caudad half; wing scales somewhat resembling Tseniorhyn- 

 chus scales, but the median scales at times inclined to be asymmetrical. 

 Cells small. Ungues in female simple and equal. 



This genus evidemtly lies near Dendromyia, Theobald, but Mr. 

 Theobald says it cannot be included under that genus, the large bunch of 

 bristles on the mesonotum being too marked a characteristic, and I there- 

 fore give it a place by itself. 



It is named after Col. C. L. Heizmann, Asst. Surgeon-General, U. S. 

 A., whose continued interest in and effective support of this research, 

 extending over several years, have been invaluable in making possible such 

 success as has been attained. 



Heizmannia scintillans, n. sp. — ? . Head brown, with brown flat, 

 iridescent (peacock blues and greens) scales, heavy white rim around the 

 eyes, and a white spot between the eyes (at point of vertex), brown bristles 

 projecting forward ; antennoe mostly gone, basal joint brown, with short 

 fine hairs on the median side ; palpi brown ; proboscis brown ; a few 

 bristles at the base ; eyes brown ; clypeus brown. 



Thorax brown ; mesonotum densely covered with dark flat, broadly 

 spindle-shaped iridescent scales ; prothoracic lobes heavily covered with 

 broad flat, white scales ; pleura brown, thickly covered with broad flat, 

 white scales ; scutellum brown, densely covered with broad flat, brown 

 iridescent scales ; metanotum rich brown, with heavy median bunch of 

 brown bristles (not less than 16-20) on caudad half. 



Abdomen dark, densely covered with broad dark (almost black) flat 

 iridescent scales ; the venter with broad white bands, very broad on the 

 cephalic segments, which extend so far around as to appear from the 

 dorsal aspect like basal lateral white spots. 



Legs, coxae and trochanters light ; femora of hind legs ventrally light, 

 less so on the other legs, and otherwise the legs are dark brown; metatarsi 

 and tarsi of fore and mid legs in some lights are almost a fawn colour ; 

 hind tarsi are missing. All the ungues equal and simple. 



