594 On Synthetic Types in Insects. 



able stylets, which are removed towards the base of the 

 abdomen more than usual, to support the long, weak 

 abdomen, reminding us of the abdominal legs of Myria- 

 pods, while the two terminal longer pairs project out 

 horizontally. 



In the two families Ephemeridce and Libcllulidfc no in- 

 stances of these analogous forms occur to us. They are 

 the most unlike other insects. 



Ascalaphus, one of the Myrmeleonidce, was described 

 by Scopoli as a Papilio, and has been said by Kirby to 

 resemble Heliconia. Indeed, if we consider the remark- 

 able departure of this genus from others of its family, 

 the mistake will seem almost pardonable. In the long 

 abruptly clubbed antennae, and the long hirsute mouth 

 parts that project between tliem and look like the palpi 

 of butterflies ; in the round, globose, prominent eyes which 

 are much like a butterfly's ; also in the short, cylindrical, 

 oval thorax, and short ovate abdomen, which is much the 

 broadest in the middle, we see that concentration of the 

 rings into the three regions of the body which obtains so 

 fully in Papilio, and is so different from Myrmeleon. 

 We shall by closer observation see that the enlarged oval 

 thorax is made so by the greatly diminished size of the 

 pro-*horax ; and in the enlarged, convex scutum of the 

 meso-thorax, and the contracted basal joint of the abdo- 

 men, compensated by the swollen middle rings, we have 

 a form that the highest Lepidoptera possess. Moreover 

 in the broad wings, the gay colors, and enjoyment of the 

 hot sun, the tropical Ascalaphus resembles the narrow, 

 transparent-winged tropical Heliconidae. 



The name of Manlispa recalls the orthopterous family 

 Matitida^ whose linear bodies, long legs, and small wings 

 find analogies in the rapacious neuropterous genus. 



The family Panorpidcc assumes dipterous shapes. 

 BUlacus has its analogue in the fly Bittacomorpha. The 



