METHODS OF COLLECTING H 



these two plates meet in a so-called pygidial carina), to allow the extrusion 

 of the copulatory apparatus. 



After such preliminary study, the genitalia should be excised and run up 

 as slide mounts, where the observations on fresh material can be checked under 

 high magnification. Once on the slide, the type of penis should be discerned, 

 e.g. whether it is bilaterally symmetrical (some Reichenbachia, Batrisodes, 

 Cylindrarctus, Tmesiphorus, etc.) or asymmetrical (some Batrisodes, Pilopius, 

 Dalmosella, etc.). 



Where the genitalia are not so extruded, they can be dissected out, work- 

 ing with the dissecting binocular and keeping the specimen under alcohol. Skill 

 acquired through practice in the handling of the small needles and knife is 

 necessar}^ here; after the genital apparatus is cut out it can be cleared and 

 made into a slide mount. Since the appartus is minute, the genitalia are easily 

 lost in the transfer to the slide; this can be overcome by using the brush, the 

 point of which has been dipped into balsam. The brush can then be touched 

 to the genitalia and lifted rapidly into the balsam on the slide. 



