1,S4 AiDKi/s Eiitomoloii^ical Society oj America [WA. III. 



I wish, however, to urge the importance of describing palpi 

 from ex]3anded specimens. A large ijroi)ortion of the figures 

 of pal])i that have been j)ublished, being of unexpanded examples 

 show comparatively little of the structure of this organ. The 

 labor involved in expanding the bulb of a pali:)us is very little; 

 a ])reparation can be made in five minutes; and in no other way 

 can so much be done to make possible a description that will 

 describe. 



The following tabular statement shows the relations of the 

 fundamental parts of the tarsus in the more specialized types 

 of palpi; not all of these parts are invariably present, and fre- 

 quently subordinate apophyses are developed. 



Body of the tarsus. 



Cymbium, containin^^ the alveolus. 

 Paracymbium. 

 Genital bulb." 



Internal parts. 



Rcceptaculum seminis. 

 Fundus. 

 Reservoir. 

 Ejaculatory duct. 

 External i:)arts. 



Basal division of the bulb. 

 Basal hffimatodocha. 

 Petiole. 

 SiibU'j^ailum. 



Lunate plate. 

 AncUi of the subtegulum. 

 Middle division of the bulb. 

 Middle ha^matodocha. 

 Tejjjulum. 



Median apophysis. 

 Paramedian ajiophysis. 

 Apical division of the bulb. 

 Conductor. 

 Embolic subdivision. 

 Radix. 

 Stipes. 

 Embolus. 



Body of embolus. 

 Pars pcndula. 



Apical sclcritc of the embolus. 

 Distal hicmatodocha. 

 Lateral subtcnninal apojjhysis. 

 Mcsal subtcnninal aiw])hysis. 



Terminal ai)0])hysis, sometimes develoijcd into a 

 fulcrum. 



