Review of Dicrotendipes Kieffer from China (Diptera, Chironomidae)

Abstract The genus Dicrotendipes Kieffer from China, including 8 species, is reviewed. Two new species, Dicrotendipes nudus sp. n. and Dicrotendipes saetanumerosus sp. n. are described and the male imagines are illustrated; the record of Dicrotendipes fusconotatus (Kieffer) is the first for China. A key to the males of Dicrotendipes in China is given.


Introduction
The genus Dicrotendipes was erected by Kieffer in 1913, with Dicrotendipes septemmaculatus (Becker, 1908) as type species. Adults of Dicrotendipes have been considered as pests due to large emergences (Frommer and Rauch 1971;Epler 1988), and have been implicated in allergic reactions in humans in Africa (Cranston et al. 1983). The immature stages are found in both lentic and lotic habitats, but are generally more prevalent in lentic situation. So far, there are 102 species recorded around the word.
In this paper, the Chinese material of Dicrotendipes is reviewed. Two new species are described, and a key to the Chinese species of Dicrotendipes is presented.

Materials and methods
The morphological nomenclature follows Saether (1980). The material examined was mounted on slides, following the procedure outlined by Saether (1969). Measurements are given as ranges followed by the mean, when three or more specimens are measured, followed by the number of specimens measured (n) in parentheses. Specimens are deposited in the College of Life Science, Nankai University, China and College of Life Science, Taizhou University, China.
Abbreviations of parts measured are as follows:

TL
Total length, Length of abdomen + length of thorax; Abdomen is measured from the concave anteriomedian margin of segment I to the apex of the gonostylus; the thorax is measured from the posterior margin of the postnotum to the anterior apex of the scutum in lateral view.

WL
Wing length, measured from arculus to apex of wing.

Pfe
Length of profemur.

Ftu
Length of frontal tubercle.
Remarks. D. saetanumerosus sp. n. closely resembles D. tamaviridis Sasa, 1981 in the structure of hypopygium, but the new species D. saetanumerosus can be separated from D. tamaviridis on the basis of following points: (1) the anal point of D. saetanumerosus sp. n. is broad and not expanded apically, but the anal point of D. tamaviridis is slender and expanded apically; and (2) the tergite IX in D. saetanumerosus sp. n. has more than 30 median setae, while D. tamaviridis has no median setae and 8−9 setae in the base of anal point.