1878.] 415 [Uhler. 



on many kinds of trees, shrubs and plants, particularly when they 

 grow adjacent to the sycamore, I have not yet discovered the young 

 brood feeding upon them. But on the sycamore, the undersides of the 

 leaves are frequently blackened by numbers of the young, sucking the 

 juices from the midrib and its branching veins. In Maryland I have 

 observed them to extend to the topmost leaves of sycamores more 

 than fifty feet from the ground. Senility, or ripe maturity, is ex- 

 pressed in these, as well as in some others of the Heteroptera, by 

 the pruinoseness of the inferior surface of the thorax and abdomen. 



Trees growing in sheltered places and near water-courses seem to 

 be most affected by them ; but I have examined many trees in high 

 and exposed places without finding a single specimen. They hiber- 

 nate beneath loose bark and stones in sheltered places. 



2. T. arcuata. 



Tingis arcuata Say, 1. c. 27, 3. Tingis juglandis Fitch, Third Re- 

 port, 1856, p. 466, No. 193. 



No. 61, in part, Harris' Collection, d, ?. " Tingis mar moratus Say, 

 MSS. On trees in great numbers. Florence, Alab. January or 

 February, 1816; Prof. Hentz. One from New Hampshire, Mr. 

 Leonard." 



Three of the specimens in this collection are of the darkest vari- 

 ety, common in Maryland upon the black-walnut. A type from Dr. 

 Fitch enables me to compare his species with that of Mr. Say, and I 

 find no characters to separate them. 



3. T. marmorata. 



Form similar to that of T. arcuata Say. Body black, the humeral 

 region and pleural margins sometimes paler, or piceous ; the venter 

 polished, minutely, transversely wrinkled. Bucculae highly elevated, 

 white ; antennae slender, the apical joint sometimes dusky. Prono 

 tal vesicle high, extending far forwards, regularly arching over the 

 head, abruptly compressed anteriorly for more than half its length; 

 the meshes large, two larger ones occupying the basal breadth ; the 

 nervures more or less embrowned, that of the middle carinate,. much 

 elevated, entire. Most of the nervures with short spines, which in 

 some specimens are obsolete. Lateral lobes of pronotum short, 

 prominent, semicircular, having the same curve anteriorly as poste- 

 riorly; narrower than the base of the hemelytra, with large, rather 

 regular cells; the nervures of the middle tinged with brown; a brown 

 spot exteriorly and sometimes a second spot at the posterior margin; 

 the marginal spines long and slender. Processus divided into cells 



PROCEEDINGS B. S. K. H. — VOL. XIX. 27 NOVEMBER, 1878. 



