318 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The nymphs of this Roach may be readily recognized by the 
dull, roughened, tuberculate surface of the posterior half of the 
abdomen, in contrast with the shining piceous surface of the 
anterior part of the body. The hind margin of the pronotum in 
the adult is distinctly produced and sub-angulate, a character 
which, with its short oval form, at once distinguishes it from our 
other species. 
The Surinam Roach is another of the introduced exotic species 
which has gained entrance as a stowaway by secreting itself in 
merchandise, and become established in greenhouses. Walden 
says that it has been very abundant for several years at Cromwell, 
Ct., and it was common for some time in a conservatory at Welles- 
ley, Mass., a number of years ago (see remarks under Periplaneta 
australasiae) . Scudder records it from Springfield, Mass. 
Adventive Species. 
Parcoblatta lata (Brunner). 
Ischnoptera lata Brunner, Nouv. Syst. Blatt., p. 135 (1865). 
A single example of this North American species, identified by 
Hebard and beheved by him to be adventive because so far out 
of the natural range of the species, is 
known from New England. The speci- 
men is a female and was captured alive 
in a dwelling-house at Wellesley, Mass., 
July 13, 1916. Satisfactory explanation 
of its presence here is unknown. The 
species resembles P. pensylvanica and 
its range extends from Delaware and 
Florida to Missouri and Texas. 
Exotic species of Roaches from the 
West Indies, Central or South America 
are frequently captured in fruit-stores 
or places where bananas or tropical 
plants are received, or on the steamers 
which bring them into port. These are to be regarded as purely 
accidental specimens, simply waifs and strays, but they are often 
sent to the entomologist with requests for information. The 
Fig. 42. — Nymph of Nytibora sp. 
A common tropical Roach intro- 
duced on fruit. (After Lugger.) 
