Il6 AN INTRODUCTION TO ENTOMOLOGY. 



named the Broad-winged Katydid ; it occurs throughout the Central 

 and Eastern States. A closely allied species, C. perspicilldtus, occurs 

 'in the South. These differ from other Katydids in having the 

 wings shorter than the tegmina, and in having the tegmina very con- 

 vex, so that the insects have an inflated appearance, instead of a 

 narrow, compressed form, as is usually the case. The Southern spe- 

 cies has shorter tegmina, more robust legs, and the musical appara- 

 tus of the male is slightly broader than in the Northern form. 



6. Amblycorypha. We have at least four species that pertain to 

 this genus. The Round-winged Katydid, A. rotundi folia, is very 

 common throughout the Northern States and Canada. It is a 

 small species ; the length of the body is 20 mm. (0.8 inch), and of 

 the tegmina 25 mm. (i 'inch). The tegmina are wide for their 

 length, as indicated by the specific name. The ovipositor is quite 

 broad, much curved, and roughly serrated. The Oblong-winged 

 Katydid, A. oblongifolia, occurs in the same region as the preceding 

 species ; it is larger, has longer tegmina, and the ovipositor is less 

 serrate and less curved.* The Tailed Katydid, A. caiiddta, occurs 

 in the South ; it is still larger than the preceding, and has a very 

 long ovipositor. The length of the body^is 25 mm. (i inch), of the 

 tegmina 37 mm. (1.5 inches), and of the ovipositor 20 mm. (0.8 inch). 

 Uhler's Katydid, A. Uhlerii, is our smallest species; it is common 

 in Maryland and about Washington. 



7, Microcentrum. The Angular-winged Katydid, Microcentrum 

 retinervis, is the commonest species in the Western and Southern 

 States. It is especially abundant in Florida, where it often injures 

 the foliage of young orange-trees. Its eggs, which are deposited in 

 one or two rows upon twigs or the margin of leaves, frequently 

 attract attention on account of their large size and the remarkable 

 regularity of their arrangement. These are shown natural size on 

 Plate III. The adult female and several nymphs are represented at 

 the same place. Frequently the eggs of this species are infested by 

 a Chalcid parasite, Eupelmus mirdbilis, which is represented en- 

 larged on the same plate (2, female ; 2#, male). There is a closely 

 allied Katydid, M. affilidtum, occurring throughout the Eastern 

 United States, which is larger, and which differs in that the slightly 

 hollowed front of the prothorax has a very small central tooth. 

 This is a rarer species than the preceding. 



* Fig. 75 of Harris's " Insects Injurious to Vegetation" is of A. rotundi folia, and not 

 of this species as indicated in the text. 



