240 
Psyche 
[September-December 
Figure 8. Eucaenus ovalis. Photograph of abdomen of specimen no. 14887 
in Illinois State Museum, Springfield (type of T. mirabile). Arrows point to some 
of the lateral lobes. Length of abdomen as shown, 9 mm. 
known about the body structure of these two families except for 
the enlargement of the prothorax. There are no other Upper Car- 
boniferous families that seem to be close to the Eucaenidae. 
Scudder (1885) placed Eucaenus in the neuropteroid section 
of the Palaeodictyoptera, an order to which he arbitrarily assigned 
all Paleozoic insects. Handlirsch (1906a, 1906b) recognized its 
orthopteroid affinities and included it in his new order Proto- 
blattoidea, which he considered an annectant group between the 
Palaeodictyoptera and the true Blattaria. Since our present knowl- 
