162 UNITED STATES NATIONAL MUSEUM BULLETIN 2 76 



Primary and secondary dorsal setae orange or yellowish. Primary and 

 secondary lateral setae varying from white to yellowish to deep orange. 

 Both dorsal and lateral secondary setae moderately dense, of medium 

 length, and not noticeably tufted. 



LARVAL DIAGNOSIS. — Larvae cannot be positively separated 

 from adjoining and intergrading populations of M. calif ornicum to the 

 west in the United States, but they can be separated from adjoining 

 populations of M. californicum pluviale in Canada by the conspicuous 

 blue lateral areas and the lack of any anterior or posterior extensions 

 or "arms" on the vertical black bar if one is present. Larvae of <;. pluviale 

 have predominantly mottled orange and black lateral areas and con- 

 spicuous anterior and posterior extensions or "arms" of the vertical 

 black bar. Larvae of M. americanum may be confused with c. lutescens 

 larvae, but see the larval diagnosis for americanum for the best ways to 

 distinguish them (page 113). 



EGG MASSES. — Laid as a basically flat, clasping mass and covered 

 with light brown to somewhat grayish spumaline, without specks, and 

 usually containing many bubbles of various sizes. 



TENTS. — They construct large tents like those of other populations 

 of M. californicum. 



COCOONS. — Fairly tightly constructed, with little or no outer 

 envelope of silk, and dusted with a pale yellow-white powder. 



FOOD PLANTS. — Egg masses were found on the following hosts: 

 Prunus virginiana, Amelanchier sp., Rosa sp., Ribes sp., Salix sp., wild plum, 

 Ribes aureum. 



TYPE. — Lectotype, here designated, a male in the United States 

 National Museum. USNM Type No. 34893. Size: 26 mm. wing- 

 spread, the wings somewhat drooping, left forewing torn, and left 

 antenna missing. It is also somewhat faded and rubbed. Data: TYPE; 

 #3, 7-11-90; var. lutescens; H. G. Dyar, No. 5332; Lectotype, Malaco- 

 soma fragile var. lutescens (Neumoegen and Dyar), male, F. W. Stehr 

 1963. The number "5332" in Dyar's catalog contains the following 

 information: 5331-2, C. A. Wiley, Miles City, Montana, Clisiocampa 

 californica? Apparently this is another instance where Dyar hesitated 

 before describing lutescens as a variety oi fragile. Genitalia in microvial 

 labeled: Lectotype, Malaco soma fragile var. lutescens (N. & D.), male 

 genitalia, F. W. Stehr 1963. 



TYPE LOCALITY. — Probably somewhere in the vicinity of Miles 

 City, Montana, although Dyar's catalog and the original description 

 only say that the specimens were received from Mr. C. A. Wiley of 

 Miles City, Montana, not that they were collected there. However, 

 larvae from that area of Montana are colored typically, so the type 

 locality is restricted to Miles City, Montana. 



