836 Charles Paul Alexander 



tho lateral abdominal spiracles protuberant, with those of the second 

 S(\e;ment very lar^e and conspicuous. Pscnidolimnophila, the Ulomorphae, 

 and Pilaria have the pronotal ])reathing horns very long and slender, 

 with the tips split into divergent flaps. In the Hexatomaria the lateral 

 abdominal spiracles are large and functional. 



The innnatun; stages of tho Polymeraria, including the single tropical 

 American genus Polymera Wiedemann, are unknown. Their discovery 

 might result in the inclusion of this subtribe with the Pediciini rather 

 than with the Hexatomini. 



The following keys separate the subtribes of the tribe Hexatomini: 



Larvae 



1. Mentum completely divided, each half with seven teeth on anterior margin; hypopharynx 



a semicircular chitinized ring with numerous teeth around anterior margin. 



Pseudolimno'philaria (p. 848) 

 Mentum when present not divided; hypopharynx not shaped as above 2 



2. Abdominal segments 2 to 7 with a basal transverse creeping-welt 3 



Abdominal segments 2 to 7 without such a welt ^ 4 



3. Mentum three-toothed; antenna elongate, the apical segment hemispherical. 



Epiphragmaria (p. 843) 

 Mentum nine-toothed; antenna short, subglobular, the apex with two short papillae. 



Ularia (p. 838) 



4. Body depressed; head capsule massive, compact; mentum heavily chitinized, seven- 



toothed; maxilla not projecting Daclylolabaria (p. 852) 



Body terete; head capsule of slender bars, not compact; mentum feeble, at most a narrow, 

 transverse bar which is delicately striate; maxilla projecting from thoracic orifice 5 



5. Mental bar present Limnophilaria (group Ldmnophilae) (p. 858) 



Mental bar lacking 6 



6. Dorsal plates of head capsule firmly united; epipharynx and maxilla densely hairy; 



mandible hinged Limnophilaria (group Ulomorphae) (p. 869) 



Dorsal plates of head capsule widely separated, at most merely contiguous behind; 

 epipharynx and maxilla not hairy; mandible not hinged Hexatomaria (p. 876) 



Pupae 



1. Two large spiracles on dorsum of eighth abdominal segment 2 



No large spiracles as above 3 



2. Pronotal breathing horns subchitinized, directed strongly ventrad; abdominal segments 



without shagreened transverse bands; pupates in wood Epiphragmaria (p. 843) 



Pronotal breathing horns flattened, directed laterad; shagreened transverse bands on 

 abdominal segments; pupates in earth Ularia (p. 838) 



3. Abdominal segments with large protuberant spiracles, those on second segment very 



large Daclylolabaria (p. 852) 



Abdominal segments without conspicuous protuberant spiracles 4 



4. Pronotal breathing horns elongate, split into two flaps at tip 5 



Pronotal breathing horns not split into two such flaps 6 



5. Abdominal segments with five or six rows of setiferous tubercles. 



Pseudolimnophilaria (p. 848) 

 Abdominal segments without such rows of tubercles. 



Limnophilaria (group Ulomorphae) (p. 869) 



