NEW SPECIES OF CERATOPOGOX. 



typical head-spine or horn, in addition to several scattered simple bristles. 

 Body minutely pubescent ; ovate lanceolate bristles in one dorsal longi- 

 tudinal row ; thoracic pair not enlarged ; dorsal bristles smooth, hyaline, 

 bulbous at base. The insertion of the pair on each segment often con- 

 nected by a transverse black line ; 3 longitudinal lateral rows of barbellate 

 bristles inserted below the ovate-lanceolate ones ; bristles black, shining, 

 with short and smooth bristles near the ventral surface, the last two segments 

 having only the upper row of these barbellate bristles. 



Pupa : 3 mm. long, spinous, light yellow ; head darker, obtuse, notched 

 below ; thorax with three spines on either side, spines barbellate, anterior 

 one mucronate ; stigma spatulate ; abdominal spines short, rough, 

 mucronate, in five longitudinal rows on either side ; those of rows I and 4 

 larger and longer than the others ; there is also a ventral row of very short 

 thick spines. Pupa attached to under surface of dung by the old larval 

 skin. 



During November, December and January the larvae of this 

 species were found in immense numbers on the under side of 

 nearly dry cow dung. They seem to feed on the dung, never pene- 

 trating very far into the substance. No eggs were found. The 

 duration of the larval stage seems to be several weeks, that o 

 the-pupal stage 7-10 days. 



The sense organs on the antennae of the imagines can be seen 

 only with a high power (500 dia.) and then it is necessary to 

 focus carefully to find them, but once found, they stand out 

 plainly. None of the wings of the males had two subcostal cells 

 and many wings of the females had only one ; but in some wings 

 the two cells show plainly. Several hundred larvae of all ages 

 were found on the under surface of a piece of moist rotting elm 

 wood ; similar larvae and puparia were also found in the nests of 

 the common foraging ant (Eciton ccccuni} on several different 

 occasions ; the author bred imagines from the larvae taken in 

 these various habitats, and they proved to be the same species. 

 This seems to be a strictly winter species, none of the various 

 stages being found during the warmer months. 



CERATOPOGON SPECULARIS Coquillett. 



$ , length 2. 5 mm., wing i. 5 x .45 mm. ; 9 , length 2 mm., wing 1.5 x .6 

 mm. One subcostal cell, third or cubital vein terminating distinctly 

 before the middle of the wing ; with a faint white spot at apex of costa 

 vein ; wings and entire insect densely pilose ; pile black ; halteres white ; 

 metatarsi equalling or slightly longer than following joint ; antennae not 



