112 PROCEEDINGS OF THE ACADEMY OF [March, 



1899. Mermiria hivittata Scudder, Proc. Amer. Acad. Arts and Sci., xxxv, 

 pp. 41 and 42. (In part.) [State records from Nebraska, Colorado, 

 Utah and possibly Iowa apply to this form.] 



1903. Mermiria texana Caudell, Proc. V. S. Nat. Mus., xxvi, p. 780. (In 

 part.) [Material from Fort Collins, Colorado.] 



1904. Mermiria biviltala Gillette (not Opsomaln hivittata Serville, 1839), 

 Bull. 94, Colo. Agr. Exp. Sta., p. 23. [Fort Collins, Laporte, Windsor, 

 Greeley, Orchard, Julesburg, Wray, Rockj'ford and Holly, Colorado.] 



1907. Mermiria bivittata Hart (not Opsomala hivittata Serville, 1839), 

 Bull. 111. State Labor. Nat. Hist., vii, p. 231. [Havana, Meredosia, 

 Tamaroa and Chatauqua, Illinois.] 



1913. Mermiria bivittata Vestal (not Opsomala bivittata Serville, 1839), 

 Ibid., X, p. 20. [Havana, Illinois.] 



This well-marked race can be distinguished in typical material 

 from M. mac. maculipennis by the less attenuate and relatively 

 more robust form, the shorter and relatively broader pronotum, 

 which is not appreciably constricted mesad, the caudal angle of 

 the disk of the pronotum being more distinctly produced and 

 angulate, the eyes of the female being less prominent from the 

 dorsum and by the generally smaller size. Under Mer. mac. maculi- 

 pennis we have discussed the relationship and intergradation of 

 the two forms. 



Type.— d" ; Forsyth, Rosebud County, Montana. July 27, 1909. 

 (Morgan Hebard.) [Hebard Collection, Type No. 445.] 



Description of Type. — Form more robust and less attenuate 

 than in M. viae, maculipennis; size smaller.''^ Head with fastigio- 

 facial angle less acute, more truncate in lateral aspect, the facial 

 line less strongly declivent. Antennse proportionately longer, 

 their length equal to at least four-fifths that of the caudal femora. 

 Pronotum distinctly shorter and proportionately broader, the 

 greatest caudal width contained about one and one-half times in 

 the greatest length of the same, narrowing of the dorsum of the 

 prozona less pronounced than in M. mac. maculipennis; caudal 

 margin of the disk of the pronotum more distinctly, though very 

 broadly; obtuse-angulate, with the immediate angle less rounded. 



Allotype. — 9 ; same data as type. [Hebard Collection.] 



Description of Allotype. — Form and size as in male. Antennae 

 proportionately longer. Pronotum distinctly shorter, and broader 

 proportionately, the narrowing of the dorsum of the prozona 

 less pronounced than in M. mac. maculipennis. 



Paratypic Series. — We have before us fourteen males and one 

 female, bearing the same data as the type and allotype, which we 



^' The small individuals of M. 7nac. maculipennis from the Rio Grande region, 

 from El Paso to Albuquerque, are hardly or not at all larger than M. mac. mac- 

 clungi, but they are distinctly more slender in every way. 



