NO. 3568 MELANOTUS — QUATE AND THOMPSON 69 



Distribution. — Southwestern U.S., Baja California. 



Arizona: Cochise, Maricopa, Pima, Pinal; April, September. California: 

 San Diego; April. Baja California: 10 mi. southwest of Comondu, 25 mi. 

 west of LaPaz, 8 mi. northwest of Los Angeles Bay, 22 mi. northwest of Pen- 

 jamo, St. Bartlme Bay, 10 mi. south of San Jose del Cabo; June, September. 



M. cribricoUis and chiricahuae are readily separable from other North 

 American Melanotus by the large pronotal punctures, shallow mandib- 

 idar pit, short antennae, and peculiar male genitalia. Their divergence 

 from other North American species and distribution in the south- 

 western U.S. suggests they are of Neotropical origin. 



M. cribricoUis differs from chiricahuae in its shorter antennae, shape 

 of the frontal margin, more rectangular shape of the flagellar segments, 

 better developed parantennal fovea, and different shape of the male 

 genitalia. 



46. Melanotus chiricahuae Knull 



Figures 7i, I2k 

 Melanotus chiricahuae Knull, 1962, p. 34. 



Male. — Large, dark reddish-bro^vn species with sparse, yellowish 

 vestiture. 



Head: Front with marked anterior depression; margin protruding 

 in front of nasale by about twice width of rim, rounded when viewed 

 from above; nasale flat, parantennal fovea very shallow, faintly 

 crescent shaped. Mandible with shallow, elongate pit near lower 

 border. Antenna exceeds tip of hind angle by about K seg- 

 ment, segment 3 intermediate in size between 2 and 4, flagellar 

 segments triangular; erect male hairs short, usually dense but may 

 be scarcely visible. 



Pronotum wider than long, pimctures very large and dense, sep- 

 arated by less than own diameter; sides of pronotum straight behind 

 anterior curvature and usually subparallel but may be divergent 

 posteriorly; hind angles divergent, each with a strong carina extending 

 cephalad of hind angle base and incurved anteriorly and a weak, 

 shorter, median carina about % length of larger one. Geni- 

 talia as figured; paramere much shorter than aedeagus, ending 

 in unusual recurved apex. 



Elytron: 8.6±0.5 mm (7.6-9.5). 21 spec. 



Female. — Similar to male; antenna shorter, extends to tip of hind 

 angle or short of tip by 1 segment; genitalia as figured, bursa with 

 thick patch of simple spines, accessory gland short, originates well 

 before apex and origin of spermathecal duct. 



Elytron: 9.2±0.5 mm (8.5-10.5). 16 spec. 



Distribution. — Southwestern U.S. 



Arizona: Cochise, Santa Cruz; June-August. New Mexico: Hidalgo; August. 

 221-532—67 6 



