640 On the Larva, Pupa, c&c. o/Orplinepliila testacea. 



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and II. ('05)." Bull. New York State Museum, Ixviii. (Eut. 18 



and 23). 

 Keilin, D. (1912,) '' Recherches surles Dipteresdu Genre Ti\ichocera.'" 



Bull. Sci. de France et Belg-. 2, xlvi. pp. 172-190. 

 Malloch, J. R. (1915.) " The Chironomidae, or Midges of Illinois, 



with particular reference to the Species occurring- in the Illinois 

 ' River." Bull. 111. State Lab. of Nat. Hist. x. Article vi. 

 Meijere, DE, J. O.II. (1902.) '' Ueber die Prothorakalstigmen der 



Bipterenpuppen." Zool. .Tahrb. xv. Abth. f. Morph. pp. 623-692. 

 . (1916.) '' Beitrage zur Kenntnis der Bipteren-Larveu und 



Puppen." Zool. Jahrb. xl. pp. 177-322. 

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Gruppe." Arch. f. Hydrobiol. Supp. Bd. ii. 2, pp. 243-376. 

 RiETH, J. Th. (1915.) ^' Die Metamorphose der Culicoidinen (Cerato- 



pogoninen)." Arch. f. Hydrobiol. Supp. Bd. ii. pp. 377-442. 

 Thienemann, A. (1909.) " Orphnephila testacea, Macq., Ein Beitrag 



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EXPLANATION OF THE PLATES. 



Key to Lettering, 



ag. Anal blood-gill. mx. Maxilla. 



ch. Curved hairs. ph. Prothoracic horn. 

 cl. Clypeus. si. Sensory hairs of legs. 



cp. Conical processes, snp. Sensory processes. 

 ds. Dorsal " saddle." sp. Spiracle. 



fc. Felt chamber, spp. Spiracular papillse. 

 fh. Fringe of hairs. ss. Striated setye. 



Ip. Lateral plate. tr. Trachea. 



md. Mandible. usp. United posterior spiracles. 

 vp. Ventral plate, 



Plate VII. 

 Fig. 1. Entire full-grown larva, lateral view. Xl2. 

 Fig. 2. Prothoracic pseudopod. X70. 

 Fig. 3. Pupa, dorsal view. xl2. 



Fig. 4. One of the lateral thoracic groups of microchsetae, si of fig. 1. 

 Fig. 5. I^arval antenna. 

 Fig. 6. Distal end of prothoracic horn. 

 Fig. 7. Larval prothoracic spiracle. 

 Fig. 8. Pupal abdominal spiracle. 

 Fig. 9. Posterior spiracle, dorsal view. 

 Fig. 10. Extremity of larva, dorsal view. 



Plate VIII. 



Fig. 11. Labium of larva, dorsal view. x200. 



Fig. 12. The same, lateral view. x200. 



Fig. 13. Labium, ventral view. 



Fig. 14. Left mandible and maxilla, inside view. X200. 



Fig. 15. The same, outside view. X 200. 



