530 



the single specimen of digitatiis before me are broken, so that it is im- 

 possible to say whether those of species C (PI. XXX, Fig. 2) resem- 

 ble them. The labial plate and other details of the two species appear 

 to be identical. 



Pupa. — Length, 4 mm. Head as in Figure 13, Plate XXXVIII, 

 the bifid projections conspicuous ; thoracic respiratory organs termi- 

 nating in numerous hairlike filaments ; disc of thorax with minute 

 setulse ; posterior margins of dorsal abdominal segments 2-6 each with 

 a transverse row of flattened setulse which are regularly spaced and of 

 rather small size ; close to the posterior margin of each segment on 

 each side of the median line are two or three fine hairs in a transverse 

 line ; near each lateral margin about middle of segments is a similar 

 single hair, and another near base on each side of median line ; lateral 

 margins of segments with a few weak, flattened hairs ; apical appen- 

 dages short, densely fringed with long hairs ; in addition to the normal 

 apical appendages there are two large ventral lobes, each ending in a 

 short thornlike point, and a central projection ending in two slender 

 rounded branches. 



Localities, Havana, June 5, 1896, Ottawa, and Meredosia, on the 

 Illinois River. 



An imago reared from one of the pupa^ obtained at Havana very 

 closely resembles fiilviis Johannsen in structure of legs and hypo- 

 pygium, but Johannsen makes no mention of the extraordinary appen- 

 dages on head of pupa, and the specimens before me show no spur on 

 middle of lateral arm of eighth abdominal segment. As the reared 

 specimen was in alcohol and in poor condition it is impossible to iden- 

 tify it authoritatively. 



Tanytarsus sp. A 



Pupa. — Length, 3-4 mm. Abdomen : second dorsal segment with 

 very weak pale setulae on posterior half, and the usual transverse 

 apical series of brown thorns ; third with weak dorsal setulae similar to 

 those on the second, and a conspicuous rounded patch of black spines 

 on median line near base; segments 4-6 with larger, slightly trans- 

 verse patches of black spines near base; apical lateral margin of eighth 

 segment with 6-8 short spines. Thoracic respiratory organs missing. 



Illinois localitv, Thompson's Lake, near Havana, April 27, 1914 

 (C. A. Hart and j. R. Malloch). 



Tanytarsus sp. B 



Pupa. — Similar to the foregoing except that there is no group of 

 black spines on the third abdominal segment. 



