1918] Crampton — Genitalia of Male Xeuropfera, etc. 51 



Planipennia, the hypandrium "hy" is even larger than that of 

 Ithone (Fig. 14, "hy"). In Nemopfera there is a large columna- 

 like structure (Fig. 1'2, "co") which has been horaologized with the 

 columna "co" of Chauliodes (Fig. 10), and in addition, a small 

 "epicolumna" labeled "p" has been developed. The columna 

 "co" of Fig. 12 bears two lobes at its apex, suggesting a bipartite 

 origin for this structure, and it is possible that it may represent the 

 united penis hooks "pu" (Figs. 4, and 10) rather than the columna 

 "co" of Fig. 10. I have provisionally homologized the lateral 

 plates "pa" of Fig. 12, with the paraprocts "pa" of Figs. 17 and 

 15; but I am not certain that this is the correct interpretation of 

 these structures. The structures labeled "g" in Fig. 12 may not 

 be the true gonopods, but have been provisionally homologized 

 with them. 



Nymphes (Fig. 3) is regarded as one of the least modified forms 

 related to the Myrmeleonidae; but it has been very difficult to 

 interpret the parts aright in this insect, and I am by no means cer- 

 tain that the conclusions here reached are the correct ones. The 

 hypandrium "hy" is well developed in Nymphes (Fig. 3), and the 

 structures apparently homologous with the penis hooks, labeled 

 "pu" in Fig. 3, are very large and bear several "prongs." The 

 structure designated "sa" in the figure probably represents the 

 supraanal plate (epiproct), although it may possibly be homologous 

 with the anal tubercle instead. I have provisionally homologized 

 the lobes "cl.'*" of Fig. 3 with the copulatory lobes "cl" of the 

 Mecopteron showm in Fig. 18; but there is a possibility that they 

 should be homologized with the plates "pa" of Fig. 17 instead. 

 The parts of Nymphes (Fig. 3) are disappointingly unlike those of 

 the Ascalaphidse (Fig. 1) and Myrmeleonidae (Fig. 7), although the 

 Ascalaphidse are very similar to the Myrmeleonidae in having a 

 dorsal plate "sa" (Figs. 1 and 7), which has been interpreted as 

 the suranal plate or epiproct, and two elongate lateral processes 

 "g" provisionally homologized with the gonopods. 



Mantispa (Fig. 5) resembles Nemoptera (Fig. 12) in having a 

 well developed hypoproct "hy," within which is a slender structure 

 labeled "co" (Fig. 5), which may possibly be homologous with the 

 structure interpreted as the columna "co" in Fig. 12. The two 

 plates "pa" of Mantispa (Fig. 5) are possibly homologous with the 

 plates labeled "pa" in Fig. 12 of Nemoptera. 



