LIOPTILUS. 41 



phorus-, but it is remarkably constant, and does not 

 occur, so far as I am aware, in any other genus of the 

 Pterophoridse. Zeller notices this peculiarity (Verh. 

 z.-b. Ges. Wien, xxv. p. 356) as pointed out to him 

 by Dr. Speyer, and states that it has not before been 

 noticed. 



LIOPTILUS, Wcdlengren, 



Lioptilus paleaceus. 



(PLATE III. FlG. 2.) 



Lioptilus paleaceus, Zeller, Verb. z.-b. Ges. Wien, xxiii. pp. 326, 327. 



This species appears to differ in some particulars 

 from any of the allied forms which I have met with 

 in California and Oregon; but I have thought it 

 desirable to have it figured in this pamphlet for con- 

 venience of comparison, without which it is extremely 

 difficult to separate several species which present very 

 slight distinctive differences. The yellowish-brown 

 head (" occipite cinnamomeo") serves best to distin- 

 guish it. It is also considerably larger than the two 

 following allied species. 



Lioptilus stramineus, sp. nov. 



(PLATE III. FIG. 3.) 



Occipite dilute brun/ico,fronte strammeo-albida. 



