CYDNIDAE OF THE WESTERN HEMISPHERE FROESCHNER 463 



Pen6n de Marquis; March, November. Guerrero: Balsas, Iguala; September. 

 Hidalgo: "Guerrero Mills," Tizayuca; November. Jalisco: Guadalajara; P'ebru- 

 ary. Baja California: Comoiidu, Miraflores, San Domingo, Triunfo; July. 

 AUxico: Tejupilco; June. Michoacdn: El Sabine, 12 miles south of Tzitzio on 

 Huetano road; July. Morelos: Cuernavaca; May, November. Puebla: Northern 

 slope (11,000 feet) of Mt. Popocatepetl; November. San Luis Potosi: El Salto; 

 June. Veracruz: "Lococos," Minatitldn; February, July. 



Guatemala: Zacapa: Zacapa; February, July. 



Bermuda: No exact locality; May. 



Discussion. — The range indicated by specimens studied ex- 

 tended across the eastern half of the United States from Massa- 

 chusetts south to Florida and Bermuda, west to South Dakota, 

 Nebraska, Kansas, Oklahoma, and Texas, thence through Arizona 

 into southern California, and south into Mexico and Guatemala. 

 The type localities of Signoret's two synonyms, douglasi and scotti, 

 were given as "Australia" and "Nouvelle-Zelande." These countries 

 are not here considered to be part of the established distribution of 

 the species. More detailed discussion of this matter is given below. 



The extensive range occupied by hilineatus brings it under many 

 and varying environmental conditions. In adapting to these con- 

 ditions the insect may be expected to show several modifications. 

 vSuch variation was recognized and noted by Uhler as early as 1877. 

 In material seen during the present study these variations were 

 present in bewildering array. The anterior outline of the head 

 varied from a full semicircle to a flattened one; the surface of the 

 head ranged from smooth and impunctate to distinctly but weakly 

 rugose (rugifrons Herrick-Schaeft'er) with scattered fine punc- 

 tures; and the number of the submarginal setigerous punctures on 

 each jugum ranged from three to five. The number of these setigerous 

 punctm'es may have some significance, but variability included unlike 

 numbers on the two sides of one individual as weU as unlike numbers 

 on specimens from the same locality, especially as the material from 

 farther north was studied. In contrast to this, the southern material 

 appeared to have a tendency toward few and more regularly arranged 

 submarginal punctures, until in Mexican specimens each jugum usually 

 has one or two close-set punctures immediatedly anterior to the eye 

 and two more widely separated ones beyond. Antennal II, while 

 usually shorter than III, sometimes was subequal to it. 



Pronotal punctation showed variation in the number and size of 

 punctures laterally on the anterior lobe, medially on the posterior 

 lobe and in the transverse impression. The number of costal setigerous 

 punctures ranged from two to five, not uncommonly differing in num- 

 ber on the two sides of one specimen. The shape of the lateral margin 

 of the metapleural evaporatorium was almost straight in some indi- 

 viduals and weakly to strongly concave in others. The length of the 



