iQio] A Structural Study of Some Caterpillars . ii 



o 



mary hair near in, and from two to four in a longitudinal line between 



iv and v, and vii (vib) : head sometimes with subprimaries, but without 



secondary hair; epicrania high, and head higher than wide; supraanal 



plate with a median horn bearing two setae at its tip ; adfrontals high 



with ii near top of front; mentum short and broad, but apparently 



with the submenta nearly meeting; labrum with vi a little distance 



from the margin. 



Three or four subprimaries on head, four setae represent vib; granu- 

 lations long and setitorm, giving an appearance of fine secondary hair; 

 subdorsal tubercles large, and present on meso- and metathorax (ib), 

 and on segment 2 of abdomen {ii) ; labral notch somewhat shallower. 

 Examples Drepana falcataria. 



D. arcuata. Figs. 89 to 92. 



Less subprimaries on head, two setae represent vib on abdomen; 

 granulations minute and conical ; subdorsal enlarged tubercles smaller 

 on thorax, and wanting on abdomen. Labral notch very deep. 

 Example Cilix glaucata. 



Geometridae. 



No secondary hair, except occasionally on prolegs; at least one sub- 

 primary subventrally, often several; prolegs with hooks usually alter- 

 nately of two lengths, the series often interrupted in the middle; 

 (see Fig. 87). Epicrania full and rounded, or with the region of seta 

 i produced into an angle; front large, the punctures rather closer 

 together than the distance between a puncture and the corresponding 

 seta ; adfrontals narrow over the top of the front ; clypeus and labrum 

 normal; mandibles usually rather thin, with sharp teeth and setae 

 close together; maxillae and labium normal, of about equal width, 

 the mentum at the base decidedly narrower than one of the submenta. 



The number of secondary setae on the proleg varies; in Cosymbia 

 only the subprimary vib is present; in Alsophila and an unidentified 

 species there is a large number; in Brephos, Hydria, Aplodes, Zerene, 

 etc., the number is intermediate, usually one besides vib. Alsophila 

 and Brephos, which have additional rudimentary prolegs, have no 

 additional setae on them. 



The planta of the Geometridae seems to be developed as a sucker 

 on both ventral and anal prolegs and in several species the hooks in 

 the center of the line are rudimentary to give it room. Such are 

 Alsophila, Zerene, etc. 



The ventral proleg varies in position with reference to its segments. 

 In Brephos it is directly below its segment, in Alsophila below the 

 incisure between its segment and the next one behind; in Aplodes, 

 Synchlora, Zerene, Ennomos, etc., it has shifted back almost beneath 

 the following segment. 



Examples Brephinae Brephos nothum 



Hydriomeninae Alsophila pometaria 



Hydria undulata 

 Sterrhinae Cosymbia lumenaria 



Geometrinae Aplodes sp. 



vSynchlora aerata 

 Ennominae Fidonia truncataria ? 



Zerene catenaria. Fig. 87. 



Lycia cognataria ? Figs. 84 to 86. 

 and several other species unidentified. 



