. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. CHENG : REVISION OP THE CHINESE MECOPTERA 5 pending upon the structure of the 6th abdominal segment of the male — that is, whether the anal horn is present, absent, or represented by two similar processes. In the first or diceras group, with double anal horn, belong diceras McLachlan, tjederi Carpenter, stotzneri Esben-Petersen and kimminsi Carpenter; in the second or centralis group, with a single anal horn, belong centralis Tjeder, flavipennis Carpenter, emarginata Cheng and obtusa Cheng; in the third or davidi grou
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. CHENG : REVISION OP THE CHINESE MECOPTERA 5 pending upon the structure of the 6th abdominal segment of the male — that is, whether the anal horn is present, absent, or represented by two similar processes. In the first or diceras group, with double anal horn, belong diceras McLachlan, tjederi Carpenter, stotzneri Esben-Petersen and kimminsi Carpenter; in the second or centralis group, with a single anal horn, belong centralis Tjeder, flavipennis Carpenter, emarginata Cheng and obtusa Cheng; in the third or davidi group, without anal horn, belong davidi Navas, stigmalis Navas, waongkehzengi Navas, difficilis Carpenter, fructa Cheng, cladocerca Navas, trifasciata. Fig. 3. Wing venation of Neopanorpa: 1A, first anal vein; Ors, origin of radial sector. n. sp., ftavicorporis n. sp., cheni n. sp., obliqua Carpenter, baoh- washana n. sp., typicoides Cheng, fukiensis Tjeder, curva Car- penter, aurea n. sp., coomani n. sp., japonica Thunberg, tetrazonia Navas, sexspinosa Cheng, tincta Navas. Other species, implicata n. sp., lutea Carpenter, klappcrichi Tjeder, semifasciata Cheng, leei Cheng, grahamana n. sp., carpenteri n. sp., statura Cheng, pusilla Cheng, pieli n. sp. and bonis Cheng, are known only from the female, so that their position in the above grouping is not determinable. Other characteristics which have been used under each group of Panorpa are the wing markings and the general aspect of both male and female genitalia. The former characteristic some- times appears to be similar from one species to another and in some cases passes through a little range of variation, while the latter remain perfectly stable even in minute details. In identification, therefore, I use the wing markings to assist in the first determination of the species and then the characteristics of both male and female genitalia for the final Please note that these images are extracted from scanned page imag
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