58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Pronotum as wide as or less wide than long; punctures at center 

 separated by about own diameter, smaller than those on front; sides of 

 pronotum straight behind small anterior curvature, parallel or diver- 

 gent posteriorly; hind angles divergent, carina extending to base of 

 hind angle, close to and paralleling side. Genitalia as figured, very 

 slender; paramere with weakly developed apical blade. 



Elytron: 6.5 ±0.4 mm (5.7-7.2). 64 spec. 



Female. — Antenna exceeds tip of hind angle by about one-half 

 segment; pronotum with sides more rounded and not parallel; internal 

 genitalia as figured, bursa with patch of close-set, plaquelike spines, 

 bases of accessory gland and spermathecal duct at apex of bursa, 

 gland not clavate. 



Elytron: 6.5 mm (6.3-7.0). 12 spec. 



Distribution. — Arizona and Texas. 



Holotype, male (USNM): Dimmit Co., Texas, May 21, 1934, light trap. 

 Allotype, female (USNM): same, June 7, 1933, H. J. Reinhard. 



Paratypes, 99 males, 12 females (USNM, CAS, CIS, CU, INHS, U. Ariz., 

 Texas A and M, CNC): Arizona. Cochise Co.: Huachuca Mts., July 19, 

 KnuU; same, Aug. 8, 9, 1952, 5400 ft., Leech and Green. Santa Cruz Co.: 

 Canelo, July 10, 1957, G. A. Butler; Nogales, Aug. 12, 1906; Santa Rita Mts., 

 July 20, 25, 1959, J. G. Franclemont. Texas. Bell Co.: Salado, April 10. 

 Bexar Co.: San Antonio, Mar. 17, 1953, B. J. Adelson. Brewster Co.: Alpine, 

 July 1-15, 1926, O. C. Poling; same, July 11, 1962, L. W. Hepner; Chisos Mts., 

 June 10-12, 1908, Mitchell and Eichmann; Santa Elena, Big Bend Nat. Pk., 

 May 4, 1959, 2,200 ft., Howden and Becker. Blanco Co.: Cypress Mills, 

 April 2. Burnet Co.: no locality, June. Cameron Co.: Brownsville, March 

 20, 1937, T. N. Freeman; same. May 17, 1904, H. S. Barber; same. May 20, 1937, 

 May 30, 1932, June 3, 1932. Dimmit Co.: no locality, March 17, 1933, April 3, 

 30, 1933, June 7, 1933. Duval Co.: San Diego, April 27. Goliad Co.: Goliad, 

 April 18, E. A. Schwarz. Gonzales Co.: Luling, April 11, 1953, at hght, B. J. 

 Adelson. Hidalgo Co.: Edinbiu-g, no date. Jeff Davis Co.: Davis Mts., June 

 28, July 8, 1946. Jefferson Co.: Sabina, March, April 1910, F. C. Pratt. Kerr 

 Co.: Kerrville, April 2-18, 1959, Becker and Howden; same, April 11, 1906, June 

 1906, F. C. Pratt. Kleberg Co.: Kingsville, no date. LaSalle Co.: CotuUa, April 17, 

 1906, May 12, 1906, March 27, 1908, F. C. Pratt. Robertson Co.: Hearne, 

 June 7, 1936, K. L. Maehler. Randall Co.: 15 mi. east of Canyon, June 26, 1956, 

 R. E. Selander. Sutton Co.: Sonora, April. Terrell Co.: Sanderson, April 27, 

 1959, Becker and Howden. Val Verde Co.: Del Rio, April 13, 1949, Michener 

 and Beamer; 13 mi. south of Del Rio, April 10, 1950, Beamer et al.; Devil's 

 River, May 5, 1907, E. A. Schwarz. Victoria Co.: Victoria, March 26, J. D. 

 Mitchell. 



M. lanceatus is closely related to longulus. The male genitalia of 

 the two are similar, but in lanceatus are much more elongate and 

 slender; the female internal genitalia have the same type of bm-sal 

 spines, but the origin of the accessory gland is in a different position 

 in each. Externally, the smaller pronotal punctm'es in lanceatus are 

 the most noticeable difference. 



