1118 
Journal of Agricultural Research 
Vol. V, No. 23 
Color characters: Byes, antennae, and legs black; head black; pro thorax and 
abdomen dull olive green with darker green marginal patches on the abdomen. 
Thoracic lobes and sternal plate black. Wing veins dark, with dusky bordering; 
the entire wing often more or less smoky. Head and thorax with a bluish white bloom; 
abdomen with a long cottony secretion, most pronounced caudad. 
Prociphilus aceris (Monell). 
Specimens of this species have a pair of large circular wax plates upon the head, 
and the dorsal wax plates of the thorax are of the same size and shape as those of 
venafuscus Patch. The sensoria on the third segment of the antennae are oval in shape, 
some almost circular. They are thus not typical for the genus, but approach those 
of attenuatus Osborn and Sirrine for which Dr. E. M. Patch, of the Maine Experiment 
Station, has erected the genus Neoprociphilus. There seems to be, however, a 
gradual gradation from the type to this species. The wing also suggests that of atten¬ 
uatus, and there is some doubt in the writer's mind in regard to the distinctness of 
Neoprociphilus. The measurements of antennal segments are as follows: III, 0.416 
mm.; IV, 0.256 mm.; V, 0.24 mm.; VI, base 0.272 mm., unguis 0.048 mm. 
Prociphilus alnifoliae (Williams) (fig. 1, /, R). 
Alnifoliae is a species of medium size with rather short antennae. The sensoria do 
not, as a rule, extend entirely across the segments, and they are often acute at each 
end, thus touching the margins of the segments as a point. The dorsal wax plates of 
the thorax are quite similar to those of corrugatans , being small and oval. 
Prociphilus bumulae (Schrank) (fig. 1, A, L). 
This species is very large and the sensoria of the antenhas are even and do not usually 
extend beyond the margins of the segment. The dorsal wax plates of the thorax are 
large and triangular and situated close together. In some specimens they almost touch 
along the median line. The measurements of antennal segments are as follows: III, 
0.704 mm.; IV, 0.32 mm.; V, 0.32 mm.; VI, base 0.288 mm., unguis 0.064 mm. 
Prociphilus corrugatans (Sirrine) (fig. 1, H, /, P). 
This insect is a rather small species with regular sensoria present on the antennae of 
the spring migrant, but with them irregularly arranged on the antennae of the fall 
migrant. The dorsal wax plates of the thorax are small and oval in outline. The 
measurements of the antennal segments are: III, 0.32 mm.; IV, 0.144 mm.; V, 0.16 
mm.; VI, base 0.128 mm., unguis 0.032 mm. 
Prociphilus fraxini-depetalae (Essig). 
This species appears to be a synonym of venafuscus Patch. 
Prociphilus imbricator (Fitch). 
This well-known species has not been figured. The sensoria of the antennae are 
rather large, approaching those of iessellatus (Fitch). The dorsal wax plates of the 
thorax are small and well separated. The measurements of antennal segments are as 
follows: 111,0.368 mm.; IV, 0.176 mm.; V, 0.176 mm.; VI, base 0.192 mm., unguis 
0.048 mm. 
Prociphilus populiconduplifolius (Cowen) (fig. 1 , G, S). 
The antennae of this species are characteristic in that the sensoria extend past the 
edges of the segments and give them an irregular or beaded effect on the margins. 
The wax plates on the thorax are also very characteristic, being minute and very 
widely separated. The antennal measurements are as follows: III, 0.4 mm.; IV, 
0.288 mm.; V, 0.208 mm.; VI, base 0.208 mm., unguis 0.064 mm. 
In the writer's opinion there is not sufficient difference for the retention of the genus 
Thecabius. The habits of the stem mothers may be different, as indicated by patchii 
Gillette, and yet the insects are very close in structure. The wax plates and sensoria 
vary greatly within the genus. 
