836 CHARLES Paunt ALEXANDER 
the lateral abdominal spiracles protuberant, with those of the second 
segment very large and conspicuous. Pseudolimnophila, the Ulomorphae, 
and Pilaria have the pronotal breathing horns very long and slender, 
with the tips split into divergent flaps. In the Hexatomaria the lateral 
abdominal spiracles are large and functional. 
The immature stages of the 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.  - 
Pseudolimnophilaria (p. ey) 
Mentum when present not divided; hypopharynx not shaped as above................ 
. Abdominal segments 2 to 7 with a basal transverse creeping=welt 51525 Ace ee eee 3 
Abdominal segments 2 to 7 without such a welt........,....0.. 00.00. cceececerecses 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- 
bo 
toothed maxallamot projectingss. 0 :..s2.0:. es eee Dactylolabaria (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 
bs WMentaldbam presenta. ism ce20 jo) see eee Limnophilaria (group Limnophilae) (p. 858) 
Mental bar lacking 3.3.05 0.0). Sino po ce ee eee 6 
6. Dorsal plates of head capsule firmly united; epipharynx and maxilla densely hairy; 
mandibleshingedin overs we een ene 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.....................-4-- 2 
No-large spiracles as above:. 12.0. 4n.. 2. ee 3 
2. Pronotal breathing horns subchitinized, directed strongly ventrad; abdominal segments 
without shagreened transverse bands; pupates in wocd........ Epiphragmaria (p. 8438) 
Pronotal breathing horns flattened, directed laterad; shagreened transverse bands on 
abdominal segments; pupates in earth..........................2-. Ularia (p. 838) 
3. Abdominal segments with large protuberant spiracles, those on second segment very 
J Petz Raia cse eee EP Ne Sia ieee tee Det ae Ue Lab eeRISE Gs Dactylolabaria (p. oS 
Abdominal segments without conspicuous protuberant spiracles....................-. 
4. Pronotal breathing horns elongate, split into two flaps at tip......................05. ; 
Pronotal breathing horns not split into two such flaps..........0... 00.0.0 cece cece eee 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) 
