philip p. calvert 353 



Explanation of Plates 



Homologous parts of the heads of females of different species are marked 

 with the same letters. The parts of the males' appendages which receive, 

 or are received by, certain parts of the females' heads are marked with the 

 same letters as the head parts, but with the addition of the prime mark ('). 

 It results that homologous parts of the males' appendages in different species 

 are not always designated by the same letters. The following letters are 

 used in many of these figures: 



dof, dorsal occipital pit (fossa) f^ 



dor, dorsal occipital transverse ridge;'' 



dot, dorsal occipital tubercle;'' 



g, groove on the rear of the head (postgcnal sulcus or groove) ; 



II, impressed lines on the same; 



los, lateral ocellar groove (sulcus) ; 



mvs, median vertex groove (sulcus) ; 



-p, pit on the rear of the head (postgenal fossa or pit) ; 



pgc, postgenal scar (cicatrix) or scars; 



poet, postocellar tubercle; 



pot, posterior occipital tubercle; 



prs, parocular groove (sulcus); 



r, ridge on rear of head (postgenal fastigium or ridge) ; 



soc, superior ocular scar (cicatrix) or scars; 



tr, transverse posterior ridge of vertex. 



Unless otherwise stated, all the figures on these three plates have been 

 drawn with the camera lucida, drawing at stage level, with Zeiss compensat- 

 ing ocular no. 2. objective A (lower lens off), and their average magnification 

 on the ]3lates is 8.0. Details were added by freehand, using a Zeiss bino- 

 cular with paired oculars 4 and paired objectives F 55. 



All the drawings by the WTiter. 



Plate XIII 



Figs. 1 to 7. — Epigomphiis subsimilis new species. Turrucures, C'osta 

 Rica, August 14, 1909, type c? and allotype 9 • 1 to ;> and 6— left profile, 

 dorsal, ventral and caudal views respectively of the apex of the o^ abdomen. 

 4 — GenitaUa of the second abdominal segment d", extruded, left profile 

 view; objective A here with lower lens on X 12.0; /(/;, posterior hamule; 

 lig, ligula (Sclimidt) or sheath of the penis; /;/(, penis; vp, vesicle of the 

 penis; pn 2, morphologically dorsal surface of the apex of the i)enis; ha, 

 apex of anterior hamule (concealed within the posterior hanmles) and lig.p, 

 apex of lateral process of hgula, drawii free hand and on a larger scale, ligs. 

 5 and 7. — Dorsal and caudal views respectively of head of female. 



"These three, pit, ridge and tubercle, are probably homologous; see under 

 E. subobtusus, antea, pages 348-9. 



TRANS. AM. ENT. SOC, XLVI. 



