472 PROCEEDINGS OF THE NATIONAL MUSEUM VoL, 113 
easily recognized by the dark spots on the head and pronotum, the 
basal hook on the anal prolegs, and the apical teeth on the mandibles. 
Description: Length, 24mm. Head, yellowish, darker around pos- 
terior half of frontal sutures; muscle scars dark, conspicuous (fig. 3,@) ; 
second segment of maxillary palpus about twice length of first; left 
mandible with 2 apical teeth, right with 1 mesal and 3 apical teeth, 
of which the middle is longest (like fig. 11,b). Thorax, pronotum 
yellowish, with dark muscle scars; posterior margin mostly pale, only 
shallowly indented near middle; fore femora but shghtly wider than 
other femora. Abdomen, anal proleg with a basoventral hook; claw 
with 1 large and 1 small ventral tooth (fig. 3,6). 
Material examined: Illinois, Lake Bluff, Pettibones Creek, 4 larvae 
(CU). Indiana, near Cicero, Upper Hinkle Creek, Apr. 4, 1954, 11 
larvae (INHS). 
Remarks: Ross (1944, p. 35) stated that the larvae “frequent small, 
rapid, clear streams that are of temporary nature during drought 
years. The adults appear during April and May in southern Illinois 
and during May and June in northern Illinois.”’ 
Rhyacophila glaberrima Ulmer 
FIGURE 3,c,d 
Rhyacophila glaberrima Ulmer, 1907, p. 85 (male genitalia)—Ross, 1944 (male 
and female genitalia, larva). 
This species is widely distributed east of the Great Plains: Georgia, 
Illinois, Massachusetts, New Hampshire, New York, North Carolina, 
Nova Scotia, Tennessee, and Virginia. 
The larvae were determined by the key and description of Ross 
(1944), whose association of stages is based on a mature male pupa. 
The short second segment of the maxillary palpus in combination with 
the presence of ventral teeth on the anal claw permits easy recognition 
of this species. 
Description: Length, 12 mm. Head, brownish yellow, slightly 
darker centrally; muscle scars paler, inconspicuous (fig. 3,¢); second 
segment of maxillary palpus subequal to first; mandibles too worn to 
be certain of dentation, but may be like those of carolina and invaria 
groups. Thorax, pronotum brownish yellow, darker centrally; muscle 
scars dark; fore femora very broad. Abdomen, anal proleg with 
neither basal hook nor apical spur, but with a short basoventral 
process attached to membrane; claw with 2 ventral teeth (fig. 3,d). 
Material examined: North Carolina, Great Smoky Mountains Na- 
tional Park, Indian Gap, July 1, 1958, 1 prepupa; Blue Ridge Parkway, 
Crabtree Meadows Campground, July 31, 1959, 1 9 pupa. 
Remarks: The few larval collections and the many adult collections 
of this species suggest that there is a preference for small brooks that 
