New Species of Paracricotopus 167 



apical spines with an average of 10 in specimens that he examined. 

 Paracricotopus millrockensis differs from P. glaber in having apical 

 anal lobe spines and an anal fringe. The larva of P. millrockensis is 

 separable from these other species by the apparently simple S I, shorter 

 postmentum, lack of a developed pre-apical procercal spur, minor dif- 

 ferences in mentum structure, and the anal tubules, which are about 2.5 

 times as long as the posterior parapods. Other characters that may 

 further separate P. millrockensis from the structurally similar P. niger 

 include a lower A.R., more posterior position of the submental setae, 

 and apparent differences in the shape and size of the anterior lacinial 

 chaetae of the maxilla (cf. Saether 1980a: 138). 



Range. — Paracricotopus millrockensis has been collected in Geor- 

 gia and North and South Carolina. The preferred habitat appears to be 

 low order streams in the Piedmont and Blue Ridge Provinces. In Geor- 

 gia, this species has been collected in Cascade Branch, Habersham 

 County, and in Millrock Branch, Rockdale County. In South Carolina, 

 it has been collected in Boone Creek, Oconee County. In North Caro- 

 lina, specimens of this species have been collected in Beaverdam Creek, 

 Wake County, Huffines Mill Creek, Rockingham County, and in an 

 unnamed stream, Macon County. The species is likely to occur in sim- 

 ilar streams in other southeastern states. 



Ecology. — In North and South Carolina streams, and Georgia 

 streams other than Millrock Branch, larvae have been collected from 

 among stone substrates in qualitative samples. In the Georgia stream 

 locally known as Millrock Branch, the species has been collected by 

 hand-picking from very shallow water on granitic bedrock among moss 

 and detritus. In this stream, most larvae have been found in association 

 with Hudsonimyia parrishi Caldwell and Soponis. Some other chiro- 

 nomids found in the same microhabitat, but not necessarily at the same 

 time, are listed in Caldwell and Soponis (1982). Millrock Branch drains 

 a relatively undeveloped, unpolluted watershed with dissolved oxygen 

 values near saturation. D. Lenat (pers. comm.), however, has collected 

 larvae in some North Carolina streams influenced by pesticides and 

 other pollutants. This would suggest that the species is not a good indi- 

 cator of water quality. 



Detritus, fungi, and algae constitute the majority of food observed 

 in gut contents of several larvae. 



ACKNOWLEDGMENTS.— The author wishes to thank Dr. A. R. 

 Soponis, Florida A & M University, for helpful suggestions on the 

 initial draft of the manuscript. North Carolina larval specimens and col- 

 lection records were furnished by Mr. D. R. Lenat, North Carolina 



