AQUATIC INSECTS IN THE ADIRONDACKS 569 



Case. (PI. S3i fig- 2) Case of irregular pieces of wood placed 

 longitudinally with slender stick extending beyond the posterior end. 

 Length 23 mm. Width 8 mm. Length of stick beyond the case about 

 19 mm. 



Larva. (PI. 32, fig. 2) Length 18 mm. Width 4 mm. Head, 

 prothorax and mesothorax reddish brown with a pattern of black spots. 

 Mesothorax has right angled black lines in the 

 posterior corners. Metathorax is yellowish 

 brown. Legs brown, margined with black. 

 Spurs on the tibiae arranged in order 2-2-2. 

 Abdomen w^hitish with red patch on the 

 dorsal side. Respiratory filaments occur with 

 or near the divisions betw^een the abdominal 

 segments. Beginning at the division between 



■t r J. J ^ 1 . Fi^. 39 Dorsal view of end of ab- 



tne nrst and second segments, they occur in domen of larva 



the following order on the dorsum, o^ o, 3, 3, 2, i, o, o, o. 

 On the ventral side their arrangement is o, o, 3, 3, 3, 2, 2 

 I, o. Anal hooks are on two-jointed prolegs. 



Pupa. (PI. S3, fig. 5) Length 19 mm. Width 4 mm. 

 Antennae 16 mm. Wings 8 mm. 3 ocelli. Head reddish 

 yellow. Thorax and legs yellow. Spurs on the tibiae 

 arranged in order i, 3, 3. Black spines numerous on the 

 legs. Abdomen white with reddish brown above and yellow 

 beneath. Heavy black fringe along the rear four segments. 



Fig. 40 Lateral . "^ o o o 



abdominid s^"- Hooks pointing backward on the anterior edge of third, 

 men^ of the fQUj.^-}^^ ^fj-]^^ sixth and Seventh segments. Plates with spikes 

 pointing forward at the posterior margin of fifth segment. Respiratory 



filaments remain. 



3 Halesus species? 



Plate 32, figures 3 and 6; plate 33, figure 3 



Habitat. Larvae and pupae found in Little Clear creek. 



Occurrence. Larvae quite common throughout the period. Pupae 

 found only during the last four days of the session. 



Case. (PI. ss, fig. 3) Cylindric case of wood and sand or small 

 stones, often finely colored. Length 24 mm. Width 6 mm. 



Larva. (PI. 32, fig. 3) Length 16 mm. Width 4 mm. Fewer 

 black spots on head but otherwise same as larva just described. The 

 length of the pupae of this species would seem to indicate that the larvae 

 taken were not full grown. 



