498 NEW YORK STATE MUSEUM 



PLATE 48 



Dixa modesta n. sp. 



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



illa with its palpus 



2 Mandible of the larva. xl90 



3 Maxilla and its palpus, 2?. xll5 



4 Pupa. xl5 



5 Larva, ventral view. xlo. a \ antral caudal lobe, b 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. xl5. 8c Subcosta. R Radius. M Media. Cu 



Cubitus. A Anal 



I>iainesa w^altlii INIeigen 



9 Ventral view of the labrum of the larva. xl90. / Jointed appendages, 



e Epipharynx 



10 Ventral view of the labium of the larva. xlOO 



11 Darval antenna. xl90 



12 Larval mandible. xl90 



13 Pupa. xl2 



PLATE 49 



Chironomus sp. 



1 Hypophai-ynx 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 laiwa, 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. xl90 



10 A^'eutral aspect of seventh, eighth and ninth abdominal segments of 



pupa 



11 Genitalia of the male. x50' 



12 Pupa 



PLATE .^O 



Thalassomyia obscura n. sp. 



1 Antenna of the larva. xl90 



2 Ventral aspect of the larval mandible. xlDO 



3 Ventral aspeot 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 



