NO. 6 



INSECT ABDOMEN — SNODGRASS 



123 



Pen. penis. 



Ph, phragnia. 



PI, pleuron. 



pi. pleurite. 



Pm, paramere (male gonapophysis of 



ninth segment). 

 PNs. meta-postnotum (precosta of 



first abdominal segment). 

 pub, pons basalis. 

 Pp, pygopod. 

 Prpt, periproct. 

 Prtpd, protopodite (united coxopodite 



and basipodite). 

 Ptar, praetarsus (dactylopodite). 



Q. depressor muscle of first trochanter. 



rvs, retractor muscles of vesicle of leg 



base, or of its derivatives. 

 rvsd, dorsal retractor of planta. 

 rvsv. ventral retractor of planta. 



S, definitive sternum (usually includ- 

 ing limb bases). 



SA3, metasternal apophysis. 



sa, lamina supra-analis. 



Sex, subcoxa. 



Sp, spiracle. 



s-p, sterno-pleural muscle. 



snicls, muscles of stylus, or of its de- 

 rivatives. 



Stn. primary segmental sternum. 



,S7v, stylus of leg base, or its deriva- 

 tives. 



T, tergum. 



Tar, tarsus (propodite). 



Tb, tibia (carpopodite). 



td, dorsal transverse muscles. 



Tel. telson. 



TIpd. telopodite. 



t-p, tergo-pleural muscle. 



Tr. trochanter. 



iTr, first trochanter (basipodite). 



:?Tr. second trochanter (ischiopodite). 



Tra, trachea. 



t-s. tergo-stcrnal muscle. 



/"•, ventral transverse muscles. 



;///. urcjgomph. 



/ ', venter. 

 T', ventral muscles. 

 ■2'cl. lateral external ventral muscles. 

 vein, median external ventral muscles. 

 vil, lateral internal ventral muscles. 

 vim, median internal ventral muscles. 

 VI, valvula. 

 F//, valvifer. 



]'Mcl, ventral longitudinal muscles. 

 J^NC, ventral nerve cord. 

 J's. vesicle of limb base, or its deriva- 

 tives. 



/-J, thoracic segments. 

 I-XII . abdominal segments. 



REFERENCE.S 



Avers, H. (1884). On the development of Oecanthus niveus and its parasite 



Teleas. Mem. Boston Soc. Nat. Hist. 3:225-281, pis. 18-25. 

 Backhoff, p. (1910). Die Entwicklung des Copulationsapparates von Agrion. 



Zeitschr. iviss. Zool. 95 : 647-706, 29 text figs., pi. 21. 

 BAUEii, A. (1910). Die Muskulatur von Dytiscus marginalis. ZeifseJir. 7i'iss. 



Zool. 95:594-646, 19 figs. Also in Korschelt (1924), Chapter 12. 

 Beckf.r, E. (1926). Zur phylogenetischen Entwicklung des Skeletts und der 



Muskulatur der Ateloceraten (Tracheaten). I. Das Tergalskelett und die 



Dorsalmuskulatur von Chilopodcn. Revue Zool. Russ. 6:3-67, 4 pis. (In 



Russian and German.) 

 Bf.rkeley, Alfreda a. (1928). 'Jjic musculature of I'andalus danae Stimson. 



Trans. R. Canadian Institute 16: Pt. 2: 181-231, pis. 1-8. 

 Berlese, a. (1906). Sopra una anomalia negli organi sessuali esterni femminei 



di Locusta viridissima L. Redia 3*305-314, 7 figs. 



