1918] Crampton — Genitalia of Male Neuroptera, etc. 49 



roptera, Mecoptera, etc., are usually homologized with the 

 so-called "gonopods" of the Ephemerida (Fig. 6, "s"), but, as was 

 pointed out in a previous paper (Crampton, 1918), the structures 

 labeled "s" in Fig. 6 of the Ephemerid, are in reality styli which 

 are segmented (arthrostyles) in some forms, and are composed 

 of a single segment in others. The segmented styli (arthrostyles) 

 labeled "s" in Fig. 6 of the Ephemerid are borne on the plate 

 "hy" situated beloiv the male genitalia, and therefore cannot 

 be homologous with the gonopods "g" of Figs. 10, 15, etc., which 

 are situated above the male genitalia, and are not borne on the plate 

 "hy," so that I have retained the term "gonopods" for the struc- 

 tures labeled "g," in Figs. 10, 15, etc., and have applied the desig- 

 nation "arthrostyles" to the segmented styli of the Ephemerida. 



The so-called "mammilliform processes of the penis,'' labeled 

 "pu" in Fig. 15, and described by Van der Weehle (Megaloptera, 

 Coll. Baron de Selys Longchamps) in Corydalis, etc.; may possi- 

 bly be homologous with the structure called the titillator by Brun- 

 ner von Wattenwyl, 1876, in the Orthoptera, since the structures 

 in question are situated above the opening of the ejaculatory ducts 

 in Corydalis, etc. (as is the case in the Orthoptera). .The structures 

 labeled "pu" in Figs. 4, 10, etc.. on the other hand, are possibly 

 homologous with the so-called penis hooks, or "penunci'' of lower 

 forms. For the sake of convenience, however, all the structures 

 labeled "pu" are here referred to as "penis hooks," regardless of 

 their position with reference to the opening of the ejaculatory ducts. 



Ventral to the penis hooks "pu" of Chauliodes (Fig. 10) is a 

 cylindrical column-like structure "co" called the columna in a 

 previous discussion of the parts in Neuroptera (Crampton, 1918). 

 Below this is the so-called genital valve "hy," which is homologous 

 with the hypandrium or suhgenital plate of the lower insects. In 

 the lower forms, the plate "hy" of the males frequently bears a 

 pair of styli; but I have been unable to find these in any of the 

 Neuroptera or Mecoptera thus far examined. The lobe-like 

 structure situated above the plate "hy" and labeled "si" in Fig. 

 15, may possibly be homologous with the so-called snhlohi of lower 

 insects (Crampton, 1918). 



In the Psocid shown in Fig. 17, there is a supraanal plate or 

 epiproct "sa" situated above the anal opening, on either side of 

 which is a parapodial plate or paraproct "pa." I would interpret 



