20 
Psyche 
[March 
7. That the planta and basipulvilli found in the Plecop- 
tera would place this order with the Neopterygota rather 
than with such types as Odonata and Ephemeroptera in 
which parts as advanced as the above have not been found 
although the presence of an empodium in Odonata must be 
considered. 
8. At this stage it is impossible to attempt any valid cor- 
relations between the types of pretarsi found in the higher 
orders other than such obvious relations as that of Trichop- 
tera to Lepidoptera. However, it is evident that the varia- 
tions of the several parts of the pretarsus found among the 
Holometabola, even in such a random selection of cases, 
warrant a thorough investigation of the condition in these 
orders with a view to possible clarification of the phyloge- 
netic implications concerned. 
Literature Cited 
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Crampton, G. C. (1923) . Preliminary note on the terminol- 
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Ent„ 55:126-132. 
Hayes & Kearns. (1934). The pretarsus (articularis) in 
Coleoptera. Ann. Ent. Soc. American, 27 : 21-33, 41 figs. 
MacGillivray, A. D. (1923). External insect-anatomy. Ur- 
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deMeijere, J. C. H. (1901). Ueber das letzte Glied der Beine 
bei den Arthropoden. Zool. Jahrb., Anat. 14:417-476, 
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— (1929) . The thoracic mechanism of a grass- 
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