54 



PSYCHE. 



f March 1S94. 



character of length of pronotuni and 

 wings. 



Take first the species called Batra- 

 chidea cristata : here the wings are 

 so small as to be quite functionless and 

 the pronotum merely covers the body, 

 often failing to reach the tip of femora. 

 Compare with it the form described as 

 B. carinata: in this the wings are large 

 and amply sufficient for flight and the 

 pronotum correspondingly developed 

 posteriorly to afford them protection 

 when closed. Owing to the high median 

 carina on the anterior portion this back- 

 ward prolongation of the tip of the 

 pronotum gives an apparently turned-up 

 appearance to its profile. B. carinata 

 is found associated with B. cristata but 

 is quite rare — but one or two specimens 

 occurring in the hundred, and I have no 

 doubt that this is hut another case of 

 reversion and should be so ranked. 



Compare the two forms known as 

 Tettigidea poly?norpha and T. later- 

 alis : the one has small wings and 

 abbreviated pronotum, the other large 

 wings and pronotum of ordinary length, 

 noticeably passing the femora. These 

 forms are about equally common and 

 are usually found associated.* 



Compare the forms known as Tettix 

 ornatus Say and T. triangularis 



* Since the above was written Mr. W. S. Blatchley 

 of Terre Haute, Ind., has informed me by letter that he 

 has taken many pairs of the two forms of Tettigidea 

 in copulation and has never seen lateralis crossed with 

 polymorpha, and in consequence considers them dis- 

 tinct species. It is perhaps best to retain them as such, 

 temporarily, at least. There is a good opportunity here 

 for some thorough, painstaking person to conduct 

 scientific breeding experiments with these interesting 

 little locusts and thereby to add materially to our 

 knowledge of the relationship of the different forms. 



Scudtl. Here again, the onh' apparent 

 difference is in the extent of pronotum 

 and length of wings, structures which in 

 this subfamily are undoubtedly interde- 

 pendent, as is shown by individuals of 

 olher species of this genus, while the 

 characters presented by the veitex and 

 eyes, which offer a safe and ready means 

 of separating these forms from the other 

 New England species, are the same. 

 In view of these facts I believe them to 

 be forms of one species. These, also, 

 are nearly always found associated, the 

 short-winged form being somewhat less 

 common. 



While I have not had opportunity to 

 study critically so large a series of speci- 

 mens as is desirable I feel reasonably 

 certain that the number of species of 

 Tettiginae found in New England should 

 be reduced to five, as follows : 



1. Tettix gramilatus ¥>.uhy. 



2. Tettix ornatus Say and T. tri- 

 angularis Scudd. 



3. Tettix cucullatus Burm. 



4. Batrachidea cristata Harris and 

 B. carinata Scudd. 



5. Tettigidea lateralis Say and T. 

 polymorpha Burm. 



Variation in wing-length seems to be 

 less proportionally in T cuciiUatus and 

 T. granulatiis than in T. or7tatiis 

 though it may be very noticeable in 

 specimens oi granulatus even from the 

 same locality. Such seems to be the 

 case, also, in regard to its constancy in 

 certain species of Mclanoplus found in 

 New England, as noted above. 



While the fact of association of the 

 two forms in the several cases mentioned 

 is no evidence of their identity, it does 



