-498 NEW YORK STATE MUSEUM 



PLATE 48 



Dixa modesta n. sp. 



1 Ventral surface of larval head. x50. I Labrum. o Antenna, mw Max- 



illa with its palpus 



2 JIandible of the larva. xl90 



3 Maxilla and its palpus, p. xllo 



4 Pupa. xl5 



5 Larva, ventral viev^. xl5. a \ entral caudal lobe. 6 Ventral foot 



bristles, c Abdominal pix)legs 



6 Dorsal view of the dorsal head sclerite. x60 



7 Dorsal view of the caudal appendages of the larva. x40. p " Tri- 



angular chitinized plate." s Spiracles 



8 Wing of the imago. xl5. 8c Subcosta. R Eadius. M Media. Cu 



Cubitus. A Anal 



Diamesa waltlii Meigen 



9 Ventral view of the labrum of the larva. xl90. j 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 



PJjATE 49 



diironomus 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 proleg. xl5 



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



x50 



6 Mandible. xllO 



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



8 Frontal aspect of the larval head. x50. il}- Labrum. ni Mandible. 



a Antenna. I Labium 



9 Dorsal aspect of the larval maxilla. xl90 



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



pupa 



11 Genitalia of the male. xaO 



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. x4G0 



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 



