Droid Sans Mono missing on Android?

I've updated to the latest Xamarin.Forms release, and figured I'd try out the new features. I wrote a simple class that inherits from ContentPage, and has a constructor like this, which takes in an object:

        var stack = new StackLayout (); 
        StringBuilder sb = new StringBuilder ();

        sb.Append ("PropertyName1:".PadRight(15) + " " + obj.Prop1 + Environment.NewLine);
            .
            .
            .
        sb.Append ("PropertyNameN:".PadRight(15) + " " + obj.PropN + Environment.NewLine);

        stack.Children.Add
        (
            new Label() 
            { 
                Text = sb.ToString (), 
                FontSize = Device.GetNamedSize (NamedSize.Medium, typeof(Label)),
                FontFamily = Device.OnPlatform (
                    iOS:      "Menlo-Regular", 
                    Android:  "Droid Sans Mono", 
                    WinPhone: "Segoe WP"),
                LineBreakMode = LineBreakMode.WordWrap
            }
        );
        stack.Spacing = 2;
        stack.Padding = new Thickness (4);

        Content = new ScrollView { VerticalOptions = LayoutOptions.Fill, Content = stack };

I've only tested it on Android, and the font never changes to Droid Sans Mono. It's still regular Droid Sans. Even when I change the FontFamily to be just "Droid Sans Mono", and test on Android, I still get regular Droid Sans. I can't seem to get Droid Sans Mono to ever show up, and I really need it for some views. I'm about to just add a custom monospace font and use it across all of my platforms, but it really seems like this should be easier. Can anyone help me resolve this issue?