166 



THE MYIUAPODA OF NORTH AMERICA. 



The cephalic segment is convex, subround, sometimes somewhat truncate posteriorly. Its 

 breadth is just about equal to its length, but owing to the convexity appears less. The 

 basilar segment is much larger than the cephalic, and has the prebasilar fold well marked. 

 The posterior portion of the scuta are often margined with green, and, in some specimens, 

 the anterior part of the body is mottled with this color. In one individual the antennae 

 arc of a pea-green tint ; generally they correspond in color with the feet. The penultimate 

 scutum is large, with its lateral margins strongly arched. The terminal scutum is me- 

 dianly slightly subcarinatc. The sterno-episternal sutures are better marked than the 

 scuto-episcutal, which arc, however, quite evident. It is noticeable that the terminal 

 scutum has a single median, instead of two lateral sutures. The preanal scale is rather 

 large, much narrowed, and very slightly emarginate posteriorly. Where the marginal 

 spines of the lateral anal appendages exceed two in number, some of them are generally 

 very small and situated at or near the base of the terminal process. I have named this 

 species in honor of Prof. Edward D. Cope, with whom it has been my good fortune to 

 have been associated since the earliest dawn of our tastes for natural history. 

 Length 4 J inches. 



TABLE SHOWING VARIATIONS IN SPECIFIC CHARACTERS. 



IJab. California. — Smithsonian Collection. 



S. I'.ISI'IMI'KS. 



S. olivacea, polita; eapite olivaeeo-oastaneo ; mandibulis magnis ; segmento cepbalico late ovato, aatioe leviter 



emarginato, basali raagno, prebasali noil..; antenni l'.i artioulatis, antice pubescentibus ; labio leviter convexo, 



sine suturis, minute punctata ; laminie dentalibus, latis, brevibus, marginibus anticis rectis, angulie postieis extemis 



; denticulia L0, conicis, parvis sed acutibua el distinctis, utrinque intimis tribus arete coadunatis, duobua 



'" 'joii.n , nt. hi outo-episcutalibus inconspicuis, ed terno-episterualibus modiee conspiouis j pedibua 



