3^ Dr. Lichtenstein's Vijcrlaiion on two Natural Genera 



Phafma^ with reipe^l to fex, are analogous to thofe of the nctvhim 

 and ediile. This being granted, we may oblerve that, I. The males 

 are always much lefs than the females. 2. Their antennae are pro- 

 portionably longer and thicker. 3. Their hemelytra are fmalier, 

 round- oval, iharper at the tip, thorncd at the bafe; thofe of the 

 females larger, oval, rounded off at the tip, without thorns, but more 

 ftrongly ribbed. 4. The females of fome fpecics are, perhaps, with- 

 out wings, although they have hemelytra, and the males have 

 really wings. The Phofma citrifolhan of the fecond family, and the 

 Ph. angulatum of the lirff, afibrd examples of this. It is not im- 

 pofTible that fome females may be found to want both wings 

 and hemelytra, whofe males may have both. At the fame time, 

 there are certainly fome males without wings in the perfect ftate. 

 Th.QPh.fliformem the Ohrtmannian colleclion is, without doubt, 

 a male, full grown, and yet without any wings. Time will 

 fhow whether or not this Ph, fiUfoj^me be the male of the 

 Ph. Ramulus. 5. The head and thorax of the male Phafma arc more 

 thorny than thofe of the female. 6. The female Py6iz/w^/^ have, 

 between the three leaves at the end of the abdomen, a proper fpine 

 for laying eggs ; the male organs, concealed in a fimilar pofition, are 

 in dried fpecimens not to be clearly diftinguifhed. 7. The forefeet 

 of the males are in proportion longer, thinner, and dentated with 

 fewer but Wronger thorns. 



Thefe obfervations may be of ufe in bringing together the fexes 

 of the fame fpecies, and may ferve to guide and affift a reader, who 

 has an opportunity of obferving thefe infeefs alive, to throw more 

 light on their economy and procreation. But, on the other hand, 

 they render difficult the determination of the fpecies. The fpecific 

 characters ought properly never to be taken from the particulars jufl 

 mentioned, as they h^jdly ever agree perfectly in both fexes. I have 

 fought as much as pofTible to avoid this error in the defcription of 



the 



