365 



8. Claws of posterior pseudopods all of one color 



Tanypus decoloratus (p. 370) . 



— Some of the claws of posterior pseudopods black, contrasting with 



the pale brown color of the others Tanypus monilis (p. 375). 



Key to Pup.e* 



1. Thoracic respiratory organs egg-shaped, large, black, and conspicu- 



ous 2 



— Thoracic respiratory organs generally elongated, trumpet-shaped, 



and pale in color 4 



2. Respiratory organ ovate, without distinct apical aperture or long 



hairlike appendages, the surface finely honeycombed, each cell 



with a small black central dot (PL XXIV, Fig. 19) 



Tanypiis monilis (p. 375) . 



— Respiratory organ with hairlike appendages 3 



3. Apex with a distinct aperture, no long apical hair present (PI. 



XXVI, Fig. 13) ProtentJies punctipennis (p. 383). 



— Apex without distinct aperture and with a long conspicuous hair 



(PI. XXIV, Fig. 7) Tanypus illinoensis (p. 376). 



4. Respiratory organ ending in a slightly produced point (PI. XXIV, 



Fig. 11), apical abdominal appendages obtusely rounded 



Protentlies culiciformis (p. 385) . 



— Respiratory organ obtuse at apex 5 



5. Apical abdominal appendage with the inner apical angle pro- 



duced 6 



— Apical abdominal appendage without a distinct production of the 



inner apical angle 7 



6. Apical production of abdominal appendage long and conspicuous, 



lateral margins of appendages with 2 long lanceolate hairs 



Protentlies stellatus\ (p. 383). 



— Apical production very short and inconspicuous, lateral margins 



of appendages without the 2 long hairs Prodadius pinguis. 



7. Apical abdominal appendages sharply pointed 8 



— Apical abdominal appendages obtuse at apex 13 



8. Thoracic respiratory organ club- or cornucopia-like 9 



— Thoracic respiratory organ with the greatest diameter before 



apex 10 



9. Thoracic respiratory organs club-shaped, no transverse row of tu- 



bercles between their bases Tanypus flavifrons. 



— Thoracic respiratory organs in the form of a cornucopia (PL 



XXIV, Fig. 14), a transverse row of short tubercles between 

 their bases Tanypus pilosellus? (p. 373). 



*Species ■without page citations are unknown to me. 



tThoraeic respiratory organ of pupa evidently broken in the specimen before me. 



