794 CHARLES PauL ALEXANDER 
16. 
Wie 
U9), 
. Spiracular disk with five lobes 
. Blades of maxillae not produced; form long and slender 
. Head capsule massive, compact, the posterior incisions usually shallow........... 5 
Head capsule of four or six slender rods, the posterior incisions profound........... 15 
. Mentum completely divided, a toothed plate on either side; abdominal segments without 
distinct creeping=weltse.0 52h eks oe wk ores Oe en ee ae 6 
Mentum, if present and chitinized, not completely divided; abdominal segments with 
kasal creeping-welts 
. Spiracular disk squarely truncated, surrounded ky five lobes... .. Eriopterini (p. see 
Spiracular disk with four lobes 
. Each mental plate four-toothed; hypopharynx labriform. 
Pedictini, subtribe Adzlphomyaria (p. 895) 
Each mental plate with seven or eight teeth; hypopharynx a comklike ring. 
Hexatomini, subtribe Pseudolimnophilaria (p. 848) 
9 
Spiraculardisk with dour lobesi7.2 9.2 sisi eee ie Ra apa a 12 
. Antennae almost globular, with two ee apical papillae; lives in fungi. 
Hexatomini, subtribe Ularia (p. eS 
Antennae elongate-cylindrical 
. Abdomen with dorsal and ventral creeping-welts; mentum with more than five ma 
Limnobiini (p. 795) 
Abdomen with six ventral welts only; mentum with five or fewer teeth.............. 11 
. Mentum five-toothed; lives in earth........ Limnobtiini, subtribe Rhamphidaria (p. 830) 
Mentum three—toothed; lives in wood..... Hexatomini, subtribe E'piphragmaria.(p. 848) 
. Antennae almost globular, with two conical apical papillae; lives in fungi. 
Hexatomini, subtribe Ularia (p. 838) 
Antennaelelongate-cylimdrical: =) S54 he An es ce eee 13 
. Abdomen with dorsal and ventral creeping-welts, the latter naked; mentum not three- 
toophed-ormsyaquatick sassee as eae nee Limnobiini, subtribe Ellipteraria (p. 806) 
Abdomen with ventral creeping-welts only; mentum with only three primary teeth; 
species not aquatic 
. Form long, slender; skin neked, shiny, transparent; apical segment of antennae elongate, 
as long as, or longer than, basal segment; mentum with a smaller tooth on either side; 
livestiniearthyeame: os ace ncyae ake Aight Limnobiini, subtribe Dicranoptycharia (p. 828) 
Form short, stout; skin white, opaque; apical segment of antennae short, hemispherical; 
mentum without small jateral teeth; lives under hark. 
Hexatomini, suktrike Epiphragmaria (p. eS) 
Blades of maxillae produced into flattened elongate appendages, the tips of which se 
trude from the thoracic orifice when the head is completely retracted; form short 
and’ Stouts. .'o.. he acces Ce be ok bea gets oa oc UR 17 
Spiracular disk squarely truncated, surrounded by five lokes which are fringed with 
numerous, usually short, hairs; esophageal region not conspicuously grooved. 
Eriopterini, subtribe Eriopteraria (p. 911) 
Spiracular disk surrounded by four lobes, each ventral lobe with a single elongate bristle; 
esophageal region elongate, grooved; lives under bark. 
Eriopterimi, subtribe Elephantomyaria (p. 952) 
Mental region a narrow, transverse, chitinized bar. 
Hexatomini, group Limnophilae (p. oe 
Mental region not chitinized 
. Mandibles hinged; maxillae and labrum densely hairy; dorsal plates of head ae 
united into a spatula SC Ae CS a iy Somer ee a Hexatomini, group Ulomorphae (p. 869) 
Mandibles not hinged; maxillae and labrum not densely hairy; dorsal plates of head 
capsule separatede oe orl. eee Hexatomini, subtribe Hexatomaria (p. 876) 
Headicapsule massive; compacts... 62... 5. ce ono) nee ee eer 20 
Head capsule of six slender rods; inves under bark. 
Eriopterini, subtribe Eriopteraria (p 911) 
