OF NORTH AMERICA. 15 



the larger size of the discal spot on the primaries, the absence of 

 enlargement on the costa, and in having seven spots to the outer band 

 on the primaries. 



Expa7ise of wings, 5 1.20 inches, ? 1.30 inches. Le7igth of body, 

 5 . o. 50 inch, ? . o. 55 inch. 



Habitat. — California. (Coll. Edwards, Behr and Stretch). 



Resembles A. Maccullochii and A. Lorquinii. From the former it 

 differs in having all the maculations pale, sulphur yellow, those on 

 the secondaries of A. Maccullochii being white, according to Kirby. 

 From A. Lorquinii it may be readily distinguished by the larger size of 

 the terminal band on all the wings, which all have one more spot than 

 in A. Lorquinii, and by the larger proportion of yellow in the 

 coloration. 



This species has a wide range in the coast counties of California, 

 north of San Francisco, appearing to prefer the mountain regions. 

 The enlargement of the costa in the males, which occurs also in A. 

 Lorquinii, finds its counterpart in the alliecf Australian genus Heca- 

 tesia, where this feature is yet more strongly marked. My friend, Mr. 

 Henry Edwards, whose enthusiastic labors have added so greatly to 

 our knowledge of California Entomology, first called my attention to 

 this similarity of structure, as also to the similarity of the clicking 

 noise made by the males of both these insects, when in pursuit of the 

 female ; a noise probably produced in some way by the drum-like 

 expansion of the costa. The imago occurs in May and June ; has a 

 very strong, rapid, irregular flight, and is exceedingly difficult to cap- 

 ture, as it is found chiefly on the mountain sides. 



8.-ALYPIA LUNATA, (PI. l, fig. 6, 5 .) N. S. 



?. — Brownish black. Head, black. Eyes, palpi and antennae, 

 black. Antennce, moderately long, very slightly thickened. Collar, 

 pale sulphur yellow. Thorax, patagia, and abdomen, entirely black. 

 Legs, entirely black, the tibiae of the middle pair alone being orna- 

 mented with orange colored scales. 



Anterior wings, full, strongly rounded at the inner angle, with the 

 costa slightly concave, and much angulated at the base, making the 

 head perceptibly less prominent. A reduced, pale sulphur yellow, 

 triangular spot at the base. A moderate, quadrate, discal spot of the 

 same color, and an outer, transverse, pale sulphur yellow band, very 

 deeply emarginate internally, giving it the appearance of two pyriform 

 spots united by their smaller extremities. Posterior wings, with a 



