20 Dana on the Classification of Animals - 
the extremity of the abdomen, or the lip, or both, and by this 
means unites bits of sticks, pebbles, etc., into a portable case or 
sheath for itself. | 
All entomological writers acknowledge that the Trichopters — 
resemble Lepidopters. They have so much the aspect of some 
Phaleenids, that they were called Mouches papillonacées by Reau- 
mur; and the larves, according to De Geer, are closely like 
caterpillars in internal organization. Other Lepidopteroid char- 
acteristics mentioned by different authors are observed in the ru- 
dimentary condition of the mandibles, the structure of the legs, 
the faculty of spinning fibres possessed by the larve, the portable 
larval sheath closely imitating those of the larves of many Tineids 
and the Psychids. One genus of Phryganeans is named Hydro- 
psyche in allusion to the resemblance, and Newman transferred 
the genus Psyche from the Lepidopters to the Trichopters. The 
species naturally constitute a hypotypic group to the Amplipens. 
The hypotypic division of a terrestrial group often consists of 
aquatic or semiaquatic species. Although the Trichopters are 
generally united to the Neuropters, they are always placed to 
one side in a group by themselves, on account of their wide di- 
vergence frem that type. The parallelism between the subdi- 
visions of Amplipens and those of the Amplipenniforms on page 
, further sustains our arrangement. : 
3. Attenuates, or Neuropters—The Neuropters are mostly long: 
amplificate, being generally slender in body, wings and legs; 
they are also widely diverse in shape and size. The win 
membranous, but are sometimes partly colored; they are often 
equal; the posterior are sometimes even the larger, but some- 
times also much the smaller, and occasionally obsolete. In 4 
few species both pairs are wanting. The mouth, unlike that of 
the Lepidopters and Homopters, but like that of most of their 
es, is not suctorial but mandibulate. Among the i 
Two of the subdivisions of Neuropters appear to be represent- 
