Key to Instar IV Larvae of Eastern Nearctic Blepharicera (Bl. tenuipes species-group)

Couplets: 1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  

Couplet 13(10)

Ecdysial stem-line short, frontoclypeal apotome reaching posterior margin of head capsule; head capsule mottled or uniformly colored, frontoclypeal apotome not noticeably darker than rest of head capsule; membranous region of antenna much shorter than apical sclerotized region; presently known only from Chattooga River...Bl. chattooga Courtney	Ecdysial stem-line long basally, frontoclypeal apotome separated from posterior margin of head capsule; frontoclypeal apotome usually darker than rest of head capsule; membranous region of antenna approximately the same length as apical sclerotized region...14