498 NEW YORK STATE MUSEUM 



PLATE 48 



Dixa modesta n. sp. 



1 Yeutral surface of larval head. x50. I Dabrum. a Antenna, mx Max- 



illa with its palpus 



2 Mandible of the larva. xl90 



3 Maxilla and its palpus, p. xllo 



4 Pupa. xl5 



5 Larva, ventral view. xlo. a \ antral caudal lobe. 6 Ventral foot 



bristles, c Abdominal prolegs 

 G Dorsal view of the dorsal head sclerite. x60 



7 Dorsal view of the caudal appendag'es of the larva. x40. p " Tri- 



angular chitinized plate." s Spiracles 



8 Wing of the imago, xlo. Sc Subcosta. R Eadius. BI Media. Cu 



Cubitus. A Anal 



Diamesa waltlii Meigen 



9 Ventral view of the labrum of the larva. xl90. ; Jointed appendages. 



e Epipharynx 



10 Ventral view of the labium of the larva. xl90 



11 Darval antenna. xl90 



12 Larval mandible. xl90 



13 Pupa. xl2 



PLATE 49 



Chironomus sp. 



1 Hypopharynx of the larva. xllO 



2 Antenna of the larva. xl90 



3 Ventral aspect of the upper lip, showing the epipharynx. xllO 



4 Head and thorax of larva, showing the thoracic prolog. xl5 



5 Ventral aspect of the head, mn Mandible, mx Maxillae. I Labium. 



xoO 



6 Mandible. xllO 



7 Caudal end of larva, with its anal prolegs. xl5 



- 8 Frontal aspect of the larval head. x50. Ir Labrum. m Mandible. 

 a Antenna. I Labium 

 9 Dorsal aspect of the larval maxilla. xj90 



10 Ventral aspect of seventh, eighth and ninth abdominal segments of 



pupa 



11 Genitalia of the male. x50 



12 Pupa 



PLATE 50 



Thalassomyia obscura n. sp. 



1 Antenna of the larva. xl90 



2 Ventral aspect of the larval mandible. xl90 



3 Ventral aspect of the upper lip (labrum). xl90. e Epipharynx 



4 Dorsal aspect of the head. x50 



5 Dorsal aspect of the larval hypopharynx. xl90 



6 Ventral aspect of the larval maxilla. xl90 



7 Armature of the thoracic prolegs. x400 



8 Labium of the larva. xl90 



9 A claw from the anal prolegs of the larva. x400 



10 Pupa 



11 Armature of the abdominal segments of the pupa 



