1914.] 



NATURAL SCIENCES OF PHILADELPHIA. 



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39. Jahrg.. pp. 248-275. 

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blatt'e {Periphvuia orientalis). Bui. Comptes Rendus des Seances Ann. 



Soc. ent. Belgique, t. 30, pp. 118-122. 

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Leop-Carol, Deut. Akad. der Naturf., vol. 38, pp. 1-251, with pis. I-VIII. 



Explanation of Plates XI, XII. 



All figures, except those in the text, are from camera lucida drawings made at 

 the base of the microscope. All drawings, except the text figures and Plate 

 XI, fig. 25, and Plate XII, fig. 26, are enlarged 875 diameters. These were 

 made with V and S4 oc. and xV oil imm. 



Abbreviations. 



C coxa. 



Ch chitin. 



ChL chitinous layer. 



Con chitinous cone. 



F femur. 



Hr hair. 



HrMS hair-mother cell. 



Hyp hypodermis . 



HypS hypodermal cell. 



HypSt hypodermal strand. 



M muscle. 



Mo mouth. 



N nerve. 



NB nerve branch. 



NF nerve fiber. 



Nic niche in which wing arises. 



NkFl neck of flask. 



PorAp pore aperture. 



PorB pore border. 



PorW pore wall. 



SC sense cell. 



SF sense fiber. 



SCNuc sense cell nucleus. 



SCNucl sense cell nucleolus. 



T trachea. 



Tb tibia. 



Tr trochanter. 



a outer margin of cone. 



aa thick chitin around flask. 



a to d groups of isolated pores. 



b inner margin of cone. 



c lowest strata of chitin. 



d outermost strata of chitin. 



e strata forming "chitinous 



layer." 



f middle strata of chitin. 



XX weak place in chitin of front 



wing where wing breaks 



off. 

 yy weak place in chitin of hind 



wing where wing breaks 



off. 

 1 to 9 groups of pores. 



Plate XI. — Fig. 3. — Group No. 8 from trochanter of female of Formica, showing 



superficial appearance of pores. ^ 



Fig. 4. — Two pores and three hairs from tibia of female of Fonnica, showing 



superficial appearance. 

 Fig. 5. — Group No. 1 on front wing of female of Formica, showing superficial 



appearance. 

 Fig. 6. — Cross-section of one of largest pores and sense cell from tibia of 



female of Formica, showing internal anatomy. 



23 



