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 (PI. XXIV, Fig. 19) 



Tanypus monilis (p. 375) . 



— Respiratory organ with hairlike appendages 3 



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



XXVI, Fig. 13) Protenthes puncUpenyiis (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 i)oint (PL XXIV, 



Fig. 11), apical abdominal appendages obtusely rounded 



Proientlies 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 



Protenthes stellatus\ (p. 383). 



— Apical production very short and inconspicuous, lateral margins 



of appendages without the 2 long hairs Procladius 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 betw^een 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 piloseUus? (p. 373) . 



*Species M\ithout page citations are unknown to nie. 



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



