On the aiititoniy of Phymateus hildc- 



brandti (Orthoptera. Phymaleidac) in 



connection with the peculiarities of 



its dermal secretion. 



E. Pawlowsky. 

 (From the Zoological Laboratory of the Imperial Military Medical Academy) 



The material that served for this Avoric was taken by 

 V. A. Dog'iel and T. 1. Solcolov in the neighbonrhood oi' Nai- 

 robi and Mabira. PJiiimateus liihlebrandti (the specimen pre- 

 served as a sample was determined by N. N. Adelung) drew 

 attention owing to its capability of discharging on the snr- 

 face of the body a foamy fluid, which is discharged chiefly 

 from a fold between the 1 and 2 abdominal segments, when 

 the insect is taken in the hands. 



Two suppositions may be made concerning the nature of 

 this fluid. It is either secreted by glands, or it is the blood 

 flowing out of the body. Owing to the lack of any data as 

 to the aspect of the fresh fluid under a microscope, the ques- 

 tion has to be solved by anatomical investigation. At an ex- 

 ternal examination of the bases of the hind legs of Phyniateus, 

 in the articulation membrane between the coxa and metatho- 

 rax, and coxa and femur, there are to be seen pores (fig. 

 1, 2 ol) leading — as it is demonstrated in the sections— into 

 special hollow hypodermal tendons which are directed with 

 their apices towards the metathorax of the insect. The tendon 

 of the membrane between the coxa and metathorax (fig. 3 ot) 

 is longer than the same between the coxa and femur (fig. 3 

 oto). To both of them muscles are attached, and in their ca- 

 vity there were traces of some kind of granular stuff (fig. 4 ot). 

 The structure described has some resemblance to the pore 

 which in Eugaster giifjoiii serves for discharging the blood 

 (\'osseler, 28, 29), and has in the open state the 

 form of a short funnel. The hollow tendon of Phumateus 



