Key to species of Jungicephus Maa, 1949.

1. Outer tooth of left mandible with a small but sharp inner tooth; 5th maxillary palpomere distinctly shorter than 3rd palpomere, 3rd maxillary palpomere 2.5 times as long as 4th palpomere; vein 2A angulated at basal corner, and being separated from vanal fold about 4 times breadth of vein 2A; lancet with 10 teeth (serrulae); frons with a deep and broad middle furrow; body punctuation fine and close all over, though sparser on vertex and scutellum........................................................................ J. mandibularis Maa, 1949

Outer tooth of left mandible without a small inner tooth (Fig. 6); 5th maxillary palpomere distinctly longer than 3rd palpomere (Fig. 4), 3rd maxillary palpomere 1.3 times as long as 4th palpomere; vein 2A roundly bent near basal corner, and being separated from vanal fold about 3 times breadth of vein 2A (Fig. 9); lancet with 13 teeth (serrulae); frons almost flat, with a very shallow middle furrow; temple very finely punctured, mesoscutum densely punctured, mesoscutellum polished, hardly punctuate............................. ............................................................................................................................................................................... J. bidentus sp. nov.