498 NEW YORK STATE MUSEUM 



j 



PLATE 48 \ 



Dixa modesta n. sp. i 



1 Ventral surface of larval head. x50. I Labrum. a Antenna, mx Max- ] 



ilia with its palpus I 



2 Mandible of the larva. xl90 \ 



3 Maxilla and its palpus, p. xll5 ^ 



4 Pupa. xl5 j 



5 Larva, ventral view. xl5. a ^ entral caudal lobe, b Ventral foot | 



bristles, c Abdominal pi-olegs - 



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. Sc Subcosta. R Radius. M Media. Cu j 



Cubitus. A Anal j 



IMamesa waltlii Meigen i 



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



e Epipharynx : 



10 Ventral view of the labium of the larva. xl90 | 



11 Larval antenna. xl90 "I 



12 Larval mandible. xl90 i 



13 Pupa. xl2 I 



PLATE 49 i 



Chironomus sp. | 



1 Hypopharj'nx of the lai'va. xllO i 



2 Antenna of the larva. xl90 j 



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



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



5 Ventral aspect of the head. 7un Mandible, mx MaxiUae. I Labium. 



x50 



6 Mandible. xllO j 



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



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



c 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. xoO ! 



12 Pupa I 



PLATE 50 



Thalassomyia obscura n. sp. 



1 Antenna of the larva. xl90 



2 Ventral aspect of the larval mandible. xl90 



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



4 Dorsal aspect of the head. x50 



5 Dorsal aspect of the larval hypopharyux. xl90 



6 A^entral aspect of the larval maxilla. xl90 



7 Armature of the thoracic prolegs. x4(>0 ! 



8 Labium of the larva. xl90 ' 



9 A claw from the anal prolegs of the larva. x4O0 ^ 



10 Pupa I 



11 Armature of the abdominal segments of the pupa I 



