132 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Male: Very similar to female differing as follows: Front distinctly 

 narrower, third joint of antennae slightly shorter, about twice the length 

 of second and slightly rounded on front apical corner. Several pairs of 

 short bristles borne below true vibrissse at lower edge of oral margin. 

 Apical cell widely open in margin and bend of fourth vein consequently 

 nearer posterior margin of wing. 



Described from two specimens male and female reared from the 

 common walking "stick Diapheromera femorata Say by H. H. 

 Severin, Milwaukee, Wisconsin, 1912, in honor of whom the 

 species is named. 



Type: A female deposited in the U. S. National Museum, Wash- 

 ington, D. C. 



THE EARLY STAGES OF METRIOCNEMUS LUNDBECKI 



JOHANNSEN. 



BY J. R. MALLOCH, Urbana, Illinois. 



The genus Metriocnemus of the Chironominae is represented in 

 the North American fauna by 11 species which with one excep- 

 tion are undescribed in either larval or pupal stages. The only 

 previously described species, M. knabi Coquillett, has been taken 

 in the larva stage in flowers of Sarracenia. It is represented in 

 the collection of the Illinois State Laboratory of Natural History 

 by a number of larvae from Wisconsin. A drawing of the labial 

 plate of this species is given herewith, fig. 9, to indicate the dis- 

 tinctions between it and that of lundbecki and also to correct 

 some slight errors in the original figure. 



The genus Metriocnemus may be distinguished from all other 

 Chironomidae by its possession of the following characters : Anten- 

 na3 of male 2-13 jointed, of female 2-6; palpi, 4 jointed; pro- 

 boscis poorly developed. Thorax projecting anteriorly, the head 

 half hidden under its anterior portion; no strong thoracic bristles. 

 Hypopygium without well developed superior and inferior proc- 

 esses in the male, the apical portion of lateral arm generally 

 slipper-shaped, recurved. Fore tarsus with tarsal joint shorter 

 than fore tibia; empodium present; claws of males generally 

 digitate apically, of female simple. Wings without the medio- 

 cubital cross vein; surface hairs distinct. 



This paper is published by permission of Dr. S. A. Forlx^, 

 State Entomologist of Illinois. 







Metriocnemus lundbecki Johannsen. 



Chironomus nanus Lundbeck (nee Meigen), Vidensk. Meddel., l>!s, 

 ]). 285. 



