ARTHROPOD A— INSECTA. 441 



B. Mesozoic Insects. 

 The only Triassic insect remains so far found in America (ex- 

 clusive of the Fairplay, Col., species now regarded as more prob- 

 ably Permic), are tracks, and the remarkable larva Mormolucoides 

 articulatus Hitchcock (Fig. 1746) from the dark shales in the 

 Connecticut Valley red sandstone. This is believed to be the 

 aquatic larva of perhaps a Neuropterous insect. A head, a thorax 

 of three segments, and an abdomen of nine segments are recog- 



FiG. 1746. Mormolucoides articulatus Hitchcock, an insect larva from the Triassic 

 shales of the Connecticut Valley; a specimen with dissociated segments, and a nearly 

 perfect individual, X 2. (After Scudder. ) 



nizable. Short cerci occur at the end of the abdomen. Numerous 

 tracks in the Connecticut Valley Triassic shale have been described 

 by Hitchcock, and referred to insects, among them being ten species 

 of Acanthichnus, five of Bifiirculapes, two of Conopsoides, four of 

 Copeza, two of Hexapodichnus, and a number of others of more 

 doubtful character. (Ichnology of New England, 1858-65.) 



In the Cretacic of North America few insect remains have so 

 far been found. A cockroach (Blattoidea) Stantoniella cretacea 

 Handlirsch has been obtained from the Judith River beds of Mon- 

 tana. From the Lower Cretacic (Comanchic?) beds of northern 

 Greenland, Heer has described three Coleoptera Archiorhynchus 

 angusticollis Heer, Curculiopsis cretacea (Heer) Handl. and Ely- 



