LIOPTILUS. 41 



2^horus; but it is remarkably constant, and does not 

 occur, so far as 1 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, WaJlengren. 



Lioptilus paleaceus. 



(Plate III. Fig. 2.) 

 Lloptllas paleaceus^ Zellor, A^erh. z.-b. Ges. Wicn, 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 dilate hnmiieo, f route stramineo-aJhida. 



